preformn.¹

Brit.

/ˈpriːfɔːm/, U.S.

/ˈpriˌfɔrm/

Origin: Apparently formed within English, by conversion. Etymon: preform v.

Etymology: Apparently < preform v. (although this is first attested slightly later in the relevant sense).

A moulded object requiring further processing to give it its final shape, which it usually resembles.

ΘΚΠ

society > occupation and work > industry > manufacturing processes > [noun] > processing > types of preliminary processing > object needing further processing

preform1931

1931 Plastics & Molded Products 7 102 The test strip..is 7¾ in. long by 1 in. wide and is molded from four preforms composed of a very soft grade of phenol-plastic compound.

1968 Encycl. Polymer Sci. & Technol. IX. 26 It is easier for an operator to pick up a preform and place it in a mold cavity or transfer pot than to have to weigh a charge of granular material.

1999 J. Hecht City of Light x. 125 They had problems keeping rod and tube surfaces clean, and wanted to pull fibers continuously, without replacing preforms.

This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022).

preformv.

Brit.

/ˌpriːˈfɔːm/, U.S.

/priˈfɔrm/

Origin: Formed within English, by derivation; originally modelled on a French lexical item. Etymons: pre- prefix, form v.¹

Etymology: < pre- prefix + form v.¹, originally after French préformer (1710). Compare post-classical Latin praeformare to form or give shape to beforehand (13th cent. in a British source; earlier in sense ‘to inform, instruct beforehand’ (12th cent. in British sources)). Compare earlier preformed adj., preformation n. With sense 1b compare slightly earlier preform n.¹

a. transitive. To form or shape beforehand. Usually in passive.

ΘΚΠ

the world > space > shape > shape or give shape to [verb (transitive)] > before

prefashion1614

preform1766

1766 tr. C. Bonnet Contempl. Nature I. Pref. p. xix When we are once convinced that organized bodies which do not seem to exist before their first appearance, were already pre-formed [Fr. préformés], we are thereby cautioned not to trust to first appearances.

1793 T. Holcroft tr. J. C. Lavater Ess. Physiognomy (abridged ed.) xxiv. 122 If the germ exists preformed in the mother [Ger. Wenn in der Mutter der präformirte Keim liegt].

1858 H. Bushnell Nature & Supernatural xi. 337 God's original scheme, taken as a whole, was so planned, or preformed.

1897 B. P. Browne Theory Thought & Knowl. ii. iv. 358 His experience is preformed in its great outlines, and in this sense is innate.

1911 Amer. Jrnl. Sociol. 17 50 To preform the child by establishing habits and attitudes..is absolutely essential in the moral growth of the child.

1971 H. C. Raley J. Ortega y Gasset iv. 88 We do not merely regard history as something in the outer world; rather it surges from within us, preforming our life.

1999 New Yorker 5 July 78/2 This works only if the subject matter has been pre-sold and pre-formed: we have to be getting a replay of a story that we're already familiar with and interested in.

b. transitive. spec. To give a shape to (plastic or other mouldable material) before final processing, esp. so that there is a resemblance to the desired final object; usually in passive. Also intransitive.

ΘΚΠ

society > occupation and work > industry > working with specific materials > working with rubber or plastic > work with rubber or plastic [verb (transitive)] > mould plastics

transfer mould1933

preform1936

post-form1961

1936 H. W. Rowell Technol. Plastics xx. 148 A ‘tablet’..is made in a stock size of die and is not preformed to the approximate shape of the moulding.

1943 D. W. Brown Handbk. Engin. Plastics i. 9 In order to reduce the size of the powder space required in moulds, the raw material is sometimes preformed into comparatively small pellets prior to being introduced into the mould.

1975 C. A. Harper Handbk. Plastics & Elastomers xii. 36 There are..transfer-type presses that will automatically feed the powder, preform, preheat, transfer, and complete the molding cycle.

2001 Mod. Plastics (Nexis) 15 Feb. Granular molding compounds are usually preformed by compacting to facilitate handling and preheated via radio frequency.

2. transitive. Biology. To establish the shape and elements of (a structure) before it is fully formed. Usually in passive.

ΚΠ

1866 Philos. Trans. (Royal Soc.) 156 118 The alisphenoid..is completely preformed in cartilage.

1880 Proc. Royal Soc. 31 64 All long bones are at an early stage preformed in cartilage.

1949 Sci. Monthly Mar. 165/2 We are vertebrates and possess an ossified skeleton, much of which was preformed in cartilage.

1985 Bull. Torrey Bot. Club 112 314/2 In mature plants, the leafy shoot is completely preformed during one summer and fully expands the following spring.

Derivatives

preˈformer n. a press or other machine for preforming plastic.

ΘΚΠ

society > occupation and work > equipment > equipment for working with other materials > [noun] > with plastics

transfer mould1933

transfer chamber1946

compression mould1951

preformer1952

slush mould1957

plug assist1958

transfer pot1963

1952 J. Delmonte Plastics Molding viii. 193 Standard single-punch preformers are illustrated in Figs. 2 and 3, and a rotary-type preforming machine is illustrated in Fig. 4.

1968 Encycl. Polymer Sci. & Technol. IX. 26 Preformers are basically compacting presses; they may be mechanical, hydraulic, pneumatic, or rotary cam-type machines.

2001 Brit. Plastics & Rubber Jan. 33/3 Included in the catalogue is a patented screw preformer which makes continuous pre-formed blanks..from cold strip or warm feed strip.

preˈforming n.

ΘΚΠ

society > occupation and work > industry > working with specific materials > working with rubber or plastic > [noun] > moulding plastics

preforming1931

injection moulding1932

compression moulding1940

transfer moulding1940

slush moulding1943

postforming1945

vacuum forming1946

drape forming1958

thermoforming1958

1931 Plastics & Molded Products 7 705 (advt.) Trouble-free preforming and more economical production with Stokes single punch and rotary preform presses.

1994 New Scientist 8 Oct. 23/2 It was directly oxidised to water and carbon dioxide without any need for pre-forming.

This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022).

单词	preform
释义	preformn.¹ Brit. /ˈpriːfɔːm/, U.S. /ˈpriˌfɔrm/ Origin: Apparently formed within English, by conversion. Etymon: preform v. Etymology: Apparently < preform v. (although this is first attested slightly later in the relevant sense). A moulded object requiring further processing to give it its final shape, which it usually resembles. ΘΚΠ society > occupation and work > industry > manufacturing processes > [noun] > processing > types of preliminary processing > object needing further processing preform1931 1931 Plastics & Molded Products 7 102 The test strip..is 7¾ in. long by 1 in. wide and is molded from four preforms composed of a very soft grade of phenol-plastic compound. 1968 Encycl. Polymer Sci. & Technol. IX. 26 It is easier for an operator to pick up a preform and place it in a mold cavity or transfer pot than to have to weigh a charge of granular material. 1999 J. Hecht City of Light x. 125 They had problems keeping rod and tube surfaces clean, and wanted to pull fibers continuously, without replacing preforms. This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022). preformn.² Brit. /ˈpriːfɔːm/, U.S. /ˈpriˌfɔrm/ Origin: Formed within English, by derivation. Etymons: pre- prefix, form n. Etymology: < pre- prefix + form n. Compare earlier protoform n. Linguistics. A linguistic form reconstructed from later evidence. Cf. protoform n. ΘΚΠ the mind > language > [noun] > linguistic change > earlier form of a word protoform1913 preform1932 1932 Language 8 38 Instead of assuming with Brugmann a preform..it would be better to regard it as the grade ZPb prō of the IE base. 1970 Internat. Jrnl. Amer. Linguistics 36 64/1 A preform kúdhe can be inferred. 1994 Harvard Stud. Classical Philol. 96 176 The operation of regular Italic and Latin sound laws on this pre-form would..produce precisely the outcome pollūceō, -ēre. This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022). preformv. Brit. /ˌpriːˈfɔːm/, U.S. /priˈfɔrm/ Origin: Formed within English, by derivation; originally modelled on a French lexical item. Etymons: pre- prefix, form v.¹ Etymology: < pre- prefix + form v.¹, originally after French préformer (1710). Compare post-classical Latin praeformare to form or give shape to beforehand (13th cent. in a British source; earlier in sense ‘to inform, instruct beforehand’ (12th cent. in British sources)). Compare earlier preformed adj., preformation n. With sense 1b compare slightly earlier preform n.¹ 1. a. transitive. To form or shape beforehand. Usually in passive. ΘΚΠ the world > space > shape > shape or give shape to [verb (transitive)] > before prefashion1614 preform1766 1766 tr. C. Bonnet Contempl. Nature I. Pref. p. xix When we are once convinced that organized bodies which do not seem to exist before their first appearance, were already pre-formed [Fr. préformés], we are thereby cautioned not to trust to first appearances. 1793 T. Holcroft tr. J. C. Lavater Ess. Physiognomy (abridged ed.) xxiv. 122 If the germ exists preformed in the mother [Ger. Wenn in der Mutter der präformirte Keim liegt]. 1858 H. Bushnell Nature & Supernatural xi. 337 God's original scheme, taken as a whole, was so planned, or preformed. 1897 B. P. Browne Theory Thought & Knowl. ii. iv. 358 His experience is preformed in its great outlines, and in this sense is innate. 1911 Amer. Jrnl. Sociol. 17 50 To preform the child by establishing habits and attitudes..is absolutely essential in the moral growth of the child. 1971 H. C. Raley J. Ortega y Gasset iv. 88 We do not merely regard history as something in the outer world; rather it surges from within us, preforming our life. 1999 New Yorker 5 July 78/2 This works only if the subject matter has been pre-sold and pre-formed: we have to be getting a replay of a story that we're already familiar with and interested in. b. transitive. spec. To give a shape to (plastic or other mouldable material) before final processing, esp. so that there is a resemblance to the desired final object; usually in passive. Also intransitive. ΘΚΠ society > occupation and work > industry > working with specific materials > working with rubber or plastic > work with rubber or plastic [verb (transitive)] > mould plastics transfer mould1933 preform1936 post-form1961 1936 H. W. Rowell Technol. Plastics xx. 148 A ‘tablet’..is made in a stock size of die and is not preformed to the approximate shape of the moulding. 1943 D. W. Brown Handbk. Engin. Plastics i. 9 In order to reduce the size of the powder space required in moulds, the raw material is sometimes preformed into comparatively small pellets prior to being introduced into the mould. 1975 C. A. Harper Handbk. Plastics & Elastomers xii. 36 There are..transfer-type presses that will automatically feed the powder, preform, preheat, transfer, and complete the molding cycle. 2001 Mod. Plastics (Nexis) 15 Feb. Granular molding compounds are usually preformed by compacting to facilitate handling and preheated via radio frequency. 2. transitive. Biology. To establish the shape and elements of (a structure) before it is fully formed. Usually in passive. ΚΠ 1866 Philos. Trans. (Royal Soc.) 156 118 The alisphenoid..is completely preformed in cartilage. 1880 Proc. Royal Soc. 31 64 All long bones are at an early stage preformed in cartilage. 1949 Sci. Monthly Mar. 165/2 We are vertebrates and possess an ossified skeleton, much of which was preformed in cartilage. 1985 Bull. Torrey Bot. Club 112 314/2 In mature plants, the leafy shoot is completely preformed during one summer and fully expands the following spring. Derivatives preˈformer n. a press or other machine for preforming plastic. ΘΚΠ society > occupation and work > equipment > equipment for working with other materials > [noun] > with plastics transfer mould1933 transfer chamber1946 compression mould1951 preformer1952 slush mould1957 plug assist1958 transfer pot1963 1952 J. Delmonte Plastics Molding viii. 193 Standard single-punch preformers are illustrated in Figs. 2 and 3, and a rotary-type preforming machine is illustrated in Fig. 4. 1968 Encycl. Polymer Sci. & Technol. IX. 26 Preformers are basically compacting presses; they may be mechanical, hydraulic, pneumatic, or rotary cam-type machines. 2001 Brit. Plastics & Rubber Jan. 33/3 Included in the catalogue is a patented screw preformer which makes continuous pre-formed blanks..from cold strip or warm feed strip. preˈforming n. ΘΚΠ society > occupation and work > industry > working with specific materials > working with rubber or plastic > [noun] > moulding plastics preforming1931 injection moulding1932 compression moulding1940 transfer moulding1940 slush moulding1943 postforming1945 vacuum forming1946 drape forming1958 thermoforming1958 1931 Plastics & Molded Products 7 705 (advt.) Trouble-free preforming and more economical production with Stokes single punch and rotary preform presses. 1994 New Scientist 8 Oct. 23/2 It was directly oxidised to water and carbon dioxide without any need for pre-forming. This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022). < n.¹1931n.²1932v.1766
随便看	slant vein slant-culture slant-drill slovenly dressed slovenly looking slovenly minded slovenly written slovenly-built slovenlybuilt slovenness slovenry slovens slovenwagon slovincian slow slow a person'one's roll slow a person's roll slow about something slow and steady wins the race slow and sure wins the race slow as molasses slow back slow ball slow bell slow boat to china

preformn.1

preformn.2

preformv.

Derivatives

preformn.¹

preformn.²