pyritohedronn.

Brit.

/pᵻˌrʌɪtəʊˈhiːdrən/, U.S.

/pəˌraɪdoʊˈhidr(ə)n/; see also pyrito- comb. form.

Inflections: Plural pyritohedra, pyritohedrons.

Origin: Formed within English, by compounding. Etymons: pyrito- comb. form, -hedron comb. form.

Etymology: < pyrito- comb. form + -hedron comb. form. N.E.D. (1909) also gives the pronunciation (-he·drǫ̆n) /-ˈhɛdrən/ for the latter element of this word.

Crystallography.

A twelve-sided polyhedron with pentagonal faces, which is particularly common in crystals of pyrite.

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

the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > polyhedron

polyhedron1570

pyritohedron1841

polyacron1862

1841 J. J. Griffin Syst. Crystallogr. i. iii. 219 The variety represented by Model 91..occurs in the mineral world as a complete crystal, particularly beautiful in Cobalt Glance and Iron Pyrites. It is thence sometimes called the Pyritohedron.

1895 N. Story-Maskelyne Crystallogr. §190. 229 A remarkable combination of pyritohedron and octahedron is a not uncommon form of pyrites and cobaltite.

1965 Proc. Amer. Philos. Soc. 109 290 The face of a small pyritohedron is..set within a more finely crystalline pyritic ground mass.

1994 Rocks & Minerals 69 226/1 Crystals of pyrite as brilliant pyritohedra or striated cubes are found here.

Derivatives

pyˌritoˈhedral adj. of the form of or relating to a pyritohedron.

ΚΠ

1854 J. D. Dana Syst. Mineral. (ed. 4) I. 39 Parallel or Pyritohedral Hemi-hexoctahedron.—When all the solid angles of the cube are replaced by three alternate planes out of six intermediaries.

1902 H. A. Miers Mineral. ii. 332 It is remarkable that there is another arsenide of cobalt of quite different composition, CoAs₃, known as skutterudite, which is also cubic and pyritohedral.

1994 Rocks & Minerals 69 226/1 Crystals of pyrite as brilliant pyritohedra..are found here... The pyritohedral crystals are ‘skewed’ along one axis.

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

单词	pyritohedron
释义	pyritohedronn. Brit. /pᵻˌrʌɪtəʊˈhiːdrən/, U.S. /pəˌraɪdoʊˈhidr(ə)n/; see also pyrito- comb. form. Inflections: Plural pyritohedra, pyritohedrons. Origin: Formed within English, by compounding. Etymons: pyrito- comb. form, -hedron comb. form. Etymology: < pyrito- comb. form + -hedron comb. form. N.E.D. (1909) also gives the pronunciation (-he·drǫ̆n) /-ˈhɛdrən/ for the latter element of this word. Crystallography. A twelve-sided polyhedron with pentagonal faces, which is particularly common in crystals of pyrite. 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 the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > polyhedron polyhedron1570 pyritohedron1841 polyacron1862 1841 J. J. Griffin Syst. Crystallogr. i. iii. 219 The variety represented by Model 91..occurs in the mineral world as a complete crystal, particularly beautiful in Cobalt Glance and Iron Pyrites. It is thence sometimes called the Pyritohedron. 1895 N. Story-Maskelyne Crystallogr. §190. 229 A remarkable combination of pyritohedron and octahedron is a not uncommon form of pyrites and cobaltite. 1965 Proc. Amer. Philos. Soc. 109 290 The face of a small pyritohedron is..set within a more finely crystalline pyritic ground mass. 1994 Rocks & Minerals 69 226/1 Crystals of pyrite as brilliant pyritohedra or striated cubes are found here. Derivatives pyˌritoˈhedral adj. of the form of or relating to a pyritohedron. ΚΠ 1854 J. D. Dana Syst. Mineral. (ed. 4) I. 39 Parallel or Pyritohedral Hemi-hexoctahedron.—When all the solid angles of the cube are replaced by three alternate planes out of six intermediaries. 1902 H. A. Miers Mineral. ii. 332 It is remarkable that there is another arsenide of cobalt of quite different composition, CoAs₃, known as skutterudite, which is also cubic and pyritohedral. 1994 Rocks & Minerals 69 226/1 Crystals of pyrite as brilliant pyritohedra..are found here... The pyritohedral crystals are ‘skewed’ along one axis. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). < n.1841
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