octahedraladj.

Brit.

/ˌɒktəˈhiːdr(ə)l/, U.S.

/ˌɑktəˈhidr(ə)l/

Forms: 1600s–1700s octoedral, 1700s octaedral, 1800s octohedral, 1800s– octahedral.

Origin: Formed within English, by compounding. Etymons: octa- comb. form, -hedral comb. form.

Etymology: < octa- comb. form + -hedral comb. form, after octahedron n. Compare earlier octahedrical adj. N.E.D. (1902) gives also the pronunciation (-he·drăl) /-ˈhɛdrəl/ for the second element.

1. Having the form of an octahedron; having eight plane (esp. triangular) faces.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having number of faces > octahedral

octahedrical1654

octahedral1684

octahedrous1702

octahedric1847

1684 R. Waller tr. Ess. Nat. Exper. Acad. del Cimento 131 The fausets (i.e.) those [diamonds] that are ground of their own Octoedral Figure [It. figura dell' ottaedro], seldom or never failed.

1745 Gentleman's Mag. June 308/2 H gives by evaporation salts of triangular planes, which unite into octoedral crystals.

1758 A. Reid tr. P. J. Macquer Elements Theory & Pract. Chym. I. 222 The crystals of Alum are octaedral... These octaedral solids are triangular pyramids, having their angles cut away, so that four of their surfaces are hexagons, and the other four triangles.

1796 Philos. Trans. (Royal Soc.) 86 292 Various modifications between the octoedral figure and the cube.

1811 J. Pinkerton Petralogy I. 312 Some detached crystals of octahedral iron.

1869 J. Phillips Vesuvius iii. 94 Crystallized in cubes and octahedral forms.

1891–2 Proc. Royal Soc. 50 299 I have a large quantity of these octahedral crystals, and I hope soon to submit them to complete analysis and investigation.

1922 T. M. Lowry Inorg. Chem. xli. 795 Cobalto-cobaltic oxide, Co₃O₄..forms black octahedral crystals, with a metallic lustre, but these are not magnetic.

1943 Amer. Jrnl. Bot. 30 78/1 Cells hexagonal in cross section and quadrilateral longitudinally would be octahedral.

1991 Discover Mar. 68/3 When he opened the barrels and examined the contents, he found no diamonds, only hard, multihued, octahedral crystals known as spinels.

2. Crystallography and Chemistry. Of or relating to an octahedron; (of a lattice site, coordination compound, etc.) having the sixfold internal symmetry of a regular octahedron.

ΘΚΠ

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

secondary1816

trapezian1816

triacontahedral1816

tri-dodecahedral1816

tri-hexahedral1816

tri-octahedral1816

tri-rhomboidal1816

octodecimal1817

octoduodecimal1817

octosexdecimal1817

pentahexahedral1817

octahedrala1824

trigonal1878

pinacoidal1879

tetartopyramid1891

trisoctahedral1891

tetartohexagonal1895

tetartosystematic1895

a1824 Encycl. Metrop. (1845) XVI. 364/2 Twinning on an octahedral face is seen in the apposition twin of Spinel.

1868 J. D. Dana Syst. Mineral. (ed. 5) 27 Monoclinic System..The octahedral planes are all hemioctahedral.

1926 Proc. Royal Soc. A. 112 458 There is an overwhelming mass of chemical evidence that compounds of the sixfold co-ordination type are based on octahedral symmetry.

1955 Amer. Mineralogist 40 350 Hydrohetaerolite has the same structure as hausmannite, except that one sixth of the trivalent manganese occupying the octahedral sites are randomly absent.

1974 D. Nicholls Inorg. Complexes v. 47 The fact that optical isomers exist for these compounds is good evidence in favour of the octahedral structure.

1994 M. B. McBride Environmental Chem. Soils ii. 35 The value of 0.414 is termed the limiting radius ratio for octahedral coordination.

1999 I. Kostov & R. I. Kostov Crystal Habits Minerals iii. 31 Cubes modified by octahedral faces correspond to the cubic habit.

This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).

单词	octahedral
释义	octahedraladj. Brit. /ˌɒktəˈhiːdr(ə)l/, U.S. /ˌɑktəˈhidr(ə)l/ Forms: 1600s–1700s octoedral, 1700s octaedral, 1800s octohedral, 1800s– octahedral. Origin: Formed within English, by compounding. Etymons: octa- comb. form, -hedral comb. form. Etymology: < octa- comb. form + -hedral comb. form, after octahedron n. Compare earlier octahedrical adj. N.E.D. (1902) gives also the pronunciation (-he·drăl) /-ˈhɛdrəl/ for the second element. 1. Having the form of an octahedron; having eight plane (esp. triangular) faces. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > having number of faces > octahedral octahedrical1654 octahedral1684 octahedrous1702 octahedric1847 1684 R. Waller tr. Ess. Nat. Exper. Acad. del Cimento 131 The fausets (i.e.) those [diamonds] that are ground of their own Octoedral Figure [It. figura dell' ottaedro], seldom or never failed. 1745 Gentleman's Mag. June 308/2 H gives by evaporation salts of triangular planes, which unite into octoedral crystals. 1758 A. Reid tr. P. J. Macquer Elements Theory & Pract. Chym. I. 222 The crystals of Alum are octaedral... These octaedral solids are triangular pyramids, having their angles cut away, so that four of their surfaces are hexagons, and the other four triangles. 1796 Philos. Trans. (Royal Soc.) 86 292 Various modifications between the octoedral figure and the cube. 1811 J. Pinkerton Petralogy I. 312 Some detached crystals of octahedral iron. 1869 J. Phillips Vesuvius iii. 94 Crystallized in cubes and octahedral forms. 1891–2 Proc. Royal Soc. 50 299 I have a large quantity of these octahedral crystals, and I hope soon to submit them to complete analysis and investigation. 1922 T. M. Lowry Inorg. Chem. xli. 795 Cobalto-cobaltic oxide, Co₃O₄..forms black octahedral crystals, with a metallic lustre, but these are not magnetic. 1943 Amer. Jrnl. Bot. 30 78/1 Cells hexagonal in cross section and quadrilateral longitudinally would be octahedral. 1991 Discover Mar. 68/3 When he opened the barrels and examined the contents, he found no diamonds, only hard, multihued, octahedral crystals known as spinels. 2. Crystallography and Chemistry. Of or relating to an octahedron; (of a lattice site, coordination compound, etc.) having the sixfold internal symmetry of a regular octahedron. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > specific crystal forms > [adjective] > miscellaneous others secondary1816 trapezian1816 triacontahedral1816 tri-dodecahedral1816 tri-hexahedral1816 tri-octahedral1816 tri-rhomboidal1816 octodecimal1817 octoduodecimal1817 octosexdecimal1817 pentahexahedral1817 octahedrala1824 trigonal1878 pinacoidal1879 tetartopyramid1891 trisoctahedral1891 tetartohexagonal1895 tetartosystematic1895 a1824 Encycl. Metrop. (1845) XVI. 364/2 Twinning on an octahedral face is seen in the apposition twin of Spinel. 1868 J. D. Dana Syst. Mineral. (ed. 5) 27 Monoclinic System..The octahedral planes are all hemioctahedral. 1926 Proc. Royal Soc. A. 112 458 There is an overwhelming mass of chemical evidence that compounds of the sixfold co-ordination type are based on octahedral symmetry. 1955 Amer. Mineralogist 40 350 Hydrohetaerolite has the same structure as hausmannite, except that one sixth of the trivalent manganese occupying the octahedral sites are randomly absent. 1974 D. Nicholls Inorg. Complexes v. 47 The fact that optical isomers exist for these compounds is good evidence in favour of the octahedral structure. 1994 M. B. McBride Environmental Chem. Soils ii. 35 The value of 0.414 is termed the limiting radius ratio for octahedral coordination. 1999 I. Kostov & R. I. Kostov Crystal Habits Minerals iii. 31 Cubes modified by octahedral faces correspond to the cubic habit. This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022). < adj.1684
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