adamantoidn.adj.

Brit.

/ˌadəˈmantɔɪd/, U.S.

/ˌædəˈmænˌtɔɪd/

Origin: Formed within English, by derivation. Etymons: adamant n., -oid suffix.

Etymology: < adamant n. + -oid suffix; in sense A. 1 after German Adamantoid ( W. von Haidinger Handb. der bestimmenden Mineral. (1845) 85).

A. n.

1. Crystallography. A polyhedron bounded by forty-eight equal scalene triangles; = hexoctahedron n. b. Now disused.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > specific crystal forms > [noun] > miscellaneous others

pyramid1748

hemihedron1837

pyritohedron1841

adamantoid1850

pyritoid1850

orthoprism1872

orthopyramid1872

polyprism1873

macropyramid1883

shish kebab1966

1850 J. D. Dana Syst. Mineral. (ed. 3) 35 Hexoctahedron. [Note] Adamantoid of Haidinger, alluding to its being a form of the diamond.

1880 E. J. Chapman Blowpipe Pract. ii. 249 Occasionally also, the edges of the rhombic dodecahedron are bevelled by the planes of the adamantoid 3-³/ ₂ or 4-⁴/ ₃.

1909 M. E. Wadsworth Crystallography vii. 130 Hexoctahedron... It is often nicknamed the Adamantoid because the Diamond..crystallizes in this form.

2. Mineralogy and Chemistry. In some classifications: a substance resembling diamond in structure or properties (cf. sense B. 1). Now disused.

ΘΚΠ

the world > the earth > minerals > types of mineral > other miscellaneous minerals > [noun] > mineral substances

quincite1835

atelestite1854

adamantoid1885

ferozone1888

polarite1889

petrichor1964

synroc1978

1885 Amer. Naturalist 19 797 The adamantoids include keilhauite, schorlomite, ilvaite, [etc.].

1892 T. S. Hunt Syst. Mineral. (ed. 2) xi. 162 Some species which we must regard as Spathoid equal or surpass in hardness certain others to which we assign a place among Adamantoids.

1904 G. D. Hinrichs Proximate Constituents Chem. Elements 64 We herewith may compare the adamantoids. Silicon 28, the dyad, increases but 45 to form germanium, which again increases 45 to form tin.

B. adj.

1. Mineralogy and Chemistry. Designating minerals, allotropes, and compounds resembling diamond in structure or properties (esp. hardness). Now disused.

ΚΠ

1857 Chemist New Ser. 4 481 A new method of preparation..enables us to obtain boron, under the distinct forms: graphitoïd boron, and adamantoïd boron, or boron diamond.

1886 T. S. Hunt Mineral Physiol. & Physiogr. viii. 366 The adamantoid persilicates constitute a characteristic and remarkable group.

1903 W. R. Cattelle Precious Stones 76 Carbon in the adamantoid form has been obtained by saturating iron with pure carbon and subjecting the molten mass..to great pressure.

†2. Mineralogy. = adamantine adj. 3. Obsolete.

ΚΠ

1864 Amer. Jrnl. Sci. 87 117 The surfaces reflected very well and exhibited an adamantoid lustre.

1891 T. E. Thorpe Dict. Appl. Chem. (ed. 2) I. 660/1 The character of the lustre is known as adamantoid.

3. Chemistry. Of a molecule: having a structure similar to that of adamantane.See note at adamantane n.

ΘΚΠ

the world > matter > chemistry > organic chemistry > hydrocarbons > [adjective] > other hydrocarbons

naphthenic1931

alternant1947

adamantoid1973

1973 Tetrahedron Lett. No. 49. 4915 The major product had a melting point 56-58°, considerably lower than in most adamantoid hydrocarbons.

1988 Angewandte Chemie (Internat. ed.) 7 852/2 A tetraammonium salt of the first known adamantoid tetramagnesium chelate complex.

2009 J. W. Steed & J. L. Atwood Supramolecular Chem. (ed. 2) vii. 419 A 3D adamantoid hydrogen-bonded network..in which each giant adamantoid cage shares a vertex with five others.

This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).

单词	adamantoid
释义	adamantoidn.adj. Brit. /ˌadəˈmantɔɪd/, U.S. /ˌædəˈmænˌtɔɪd/ Origin: Formed within English, by derivation. Etymons: adamant n., -oid suffix. Etymology: < adamant n. + -oid suffix; in sense A. 1 after German Adamantoid ( W. von Haidinger Handb. der bestimmenden Mineral. (1845) 85). A. n. 1. Crystallography. A polyhedron bounded by forty-eight equal scalene triangles; = hexoctahedron n. b. Now disused. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > specific crystal forms > [noun] > miscellaneous others pyramid1748 hemihedron1837 pyritohedron1841 adamantoid1850 pyritoid1850 orthoprism1872 orthopyramid1872 polyprism1873 macropyramid1883 shish kebab1966 1850 J. D. Dana Syst. Mineral. (ed. 3) 35 Hexoctahedron. [Note] Adamantoid of Haidinger, alluding to its being a form of the diamond. 1880 E. J. Chapman Blowpipe Pract. ii. 249 Occasionally also, the edges of the rhombic dodecahedron are bevelled by the planes of the adamantoid 3-³/ ₂ or 4-⁴/ ₃. 1909 M. E. Wadsworth Crystallography vii. 130 Hexoctahedron... It is often nicknamed the Adamantoid because the Diamond..crystallizes in this form. 2. Mineralogy and Chemistry. In some classifications: a substance resembling diamond in structure or properties (cf. sense B. 1). Now disused. ΘΚΠ the world > the earth > minerals > types of mineral > other miscellaneous minerals > [noun] > mineral substances quincite1835 atelestite1854 adamantoid1885 ferozone1888 polarite1889 petrichor1964 synroc1978 1885 Amer. Naturalist 19 797 The adamantoids include keilhauite, schorlomite, ilvaite, [etc.]. 1892 T. S. Hunt Syst. Mineral. (ed. 2) xi. 162 Some species which we must regard as Spathoid equal or surpass in hardness certain others to which we assign a place among Adamantoids. 1904 G. D. Hinrichs Proximate Constituents Chem. Elements 64 We herewith may compare the adamantoids. Silicon 28, the dyad, increases but 45 to form germanium, which again increases 45 to form tin. B. adj. 1. Mineralogy and Chemistry. Designating minerals, allotropes, and compounds resembling diamond in structure or properties (esp. hardness). Now disused. ΚΠ 1857 Chemist New Ser. 4 481 A new method of preparation..enables us to obtain boron, under the distinct forms: graphitoïd boron, and adamantoïd boron, or boron diamond. 1886 T. S. Hunt Mineral Physiol. & Physiogr. viii. 366 The adamantoid persilicates constitute a characteristic and remarkable group. 1903 W. R. Cattelle Precious Stones 76 Carbon in the adamantoid form has been obtained by saturating iron with pure carbon and subjecting the molten mass..to great pressure. †2. Mineralogy. = adamantine adj. 3. Obsolete. ΚΠ 1864 Amer. Jrnl. Sci. 87 117 The surfaces reflected very well and exhibited an adamantoid lustre. 1891 T. E. Thorpe Dict. Appl. Chem. (ed. 2) I. 660/1 The character of the lustre is known as adamantoid. 3. Chemistry. Of a molecule: having a structure similar to that of adamantane.See note at adamantane n. ΘΚΠ the world > matter > chemistry > organic chemistry > hydrocarbons > [adjective] > other hydrocarbons naphthenic1931 alternant1947 adamantoid1973 1973 Tetrahedron Lett. No. 49. 4915 The major product had a melting point 56-58°, considerably lower than in most adamantoid hydrocarbons. 1988 Angewandte Chemie (Internat. ed.) 7 852/2 A tetraammonium salt of the first known adamantoid tetramagnesium chelate complex. 2009 J. W. Steed & J. L. Atwood Supramolecular Chem. (ed. 2) vii. 419 A 3D adamantoid hydrogen-bonded network..in which each giant adamantoid cage shares a vertex with five others. This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021). < n.adj.1850
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