end-pointn.

Etymology: < end n. + point n.¹Previous versions of the OED give the stress as: ˈend-point.

The end or latter part of a period, process, etc.

1. spec. in Chemistry, etc. The point in a titration, or the stage of a process of dilution, at which a definite effect is observable.

ΘΚΠ

the world > matter > chemistry > chemical assay or analytical chemistry > [noun] > acetimetry > titration > end-point

end-point1899

1899 G. G. Henderson & M. A. Parker Introd. Analyt. Chem. 114 The exact point at which neutralization takes place (‘the end point’) is determined by means of an indicator.

1919 Chemist & Druggist XCI. 243 The solution is very slowly decolorised at first... The end point was taken as the faintest visibly pink tint, permanent for one minute.

1946 Nature 19 Oct. 556/2 The concentration of chloride in the blood of agouti and black mice has been investigated..but with only 0.22 c.c. of serum the end-point is not certain.

1956 Nature 18 Feb. 303/2 Tobacco seedlings show systemic symptoms sooner when inoculated with tobacco sap diluted almost to the infection end-point than when they are inoculated with undiluted sap from infected Prince beans.

1961 Lancet 29 July 228/1 In the tube dilution methods the end-point was taken as the last tube showing visible growth after 48 hours incubation at 35–37°C.

1963 Lancet 5 Jan. 52/2 ‘Total acid’ meant titratable acidity to an end-point about pH 8–10 (phenolphthalein).

2. transferred and figurative.

ΘΚΠ

the world > relative properties > order > order, sequence, or succession > end or conclusion > [noun] > the latter part

eveningOE

enda1200

eventide?c1225

finea1350

tail1377

latter (last) enda1382

issue1484

latter day?1498

waning1561

last days1572

heel1584

sunsetting1593

fall1596

lag-end1598

posterior1598

sunset1599

dotage1606

exit1615

stern1623

waning timea1639

last1683

heel piecea1764

shank1828

tail-end1845

tailpiece1869

tag1882

teatime1913

end-point1921

1921 E. Sapir Lang. (1922) v. 115 The starting-point and end-point of the flow of activity.

1927 L. Clendening Human Body iv. 109 (caption) An air sac. The end point of a lung branch.

1959 J. C. Catford in R. Quirk & A. H. Smith Teaching of Eng. vi. 183 The variations in the vertical dimension..represent..different types of end-point, or ‘second term’, for the relations represented.

1965 W. S. Allen Vox Latina ii. 60 Scaurus..who comments on the current end-point of the dipthong as e rather than i.

This entry has not yet been fully updated (first published 1972; most recently modified version published online December 2021).

单词	end-point
释义	end-pointn. Etymology: < end n. + point n.¹Previous versions of the OED give the stress as: ˈend-point. The end or latter part of a period, process, etc. 1. spec. in Chemistry, etc. The point in a titration, or the stage of a process of dilution, at which a definite effect is observable. ΘΚΠ the world > matter > chemistry > chemical assay or analytical chemistry > [noun] > acetimetry > titration > end-point end-point1899 1899 G. G. Henderson & M. A. Parker Introd. Analyt. Chem. 114 The exact point at which neutralization takes place (‘the end point’) is determined by means of an indicator. 1919 Chemist & Druggist XCI. 243 The solution is very slowly decolorised at first... The end point was taken as the faintest visibly pink tint, permanent for one minute. 1946 Nature 19 Oct. 556/2 The concentration of chloride in the blood of agouti and black mice has been investigated..but with only 0.22 c.c. of serum the end-point is not certain. 1956 Nature 18 Feb. 303/2 Tobacco seedlings show systemic symptoms sooner when inoculated with tobacco sap diluted almost to the infection end-point than when they are inoculated with undiluted sap from infected Prince beans. 1961 Lancet 29 July 228/1 In the tube dilution methods the end-point was taken as the last tube showing visible growth after 48 hours incubation at 35–37°C. 1963 Lancet 5 Jan. 52/2 ‘Total acid’ meant titratable acidity to an end-point about pH 8–10 (phenolphthalein). 2. transferred and figurative. ΘΚΠ the world > relative properties > order > order, sequence, or succession > end or conclusion > [noun] > the latter part eveningOE enda1200 eventide?c1225 finea1350 tail1377 latter (last) enda1382 issue1484 latter day?1498 waning1561 last days1572 heel1584 sunsetting1593 fall1596 lag-end1598 posterior1598 sunset1599 dotage1606 exit1615 stern1623 waning timea1639 last1683 heel piecea1764 shank1828 tail-end1845 tailpiece1869 tag1882 teatime1913 end-point1921 1921 E. Sapir Lang. (1922) v. 115 The starting-point and end-point of the flow of activity. 1927 L. Clendening Human Body iv. 109 (caption) An air sac. The end point of a lung branch. 1959 J. C. Catford in R. Quirk & A. H. Smith Teaching of Eng. vi. 183 The variations in the vertical dimension..represent..different types of end-point, or ‘second term’, for the relations represented. 1965 W. S. Allen Vox Latina ii. 60 Scaurus..who comments on the current end-point of the dipthong as e rather than i. This entry has not yet been fully updated (first published 1972; most recently modified version published online December 2021). < n.1899
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