hemihedronn.

/hɛmɪˈhiːdrən/

/hɛmɪˈhɛdrən/

Etymology: < hemi- prefix 3 + Greek ἕδρα after hexahedron, etc. Compare French hémièdre.

Crystallography.

A form or crystal of a hemihedral type.

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

1837 J. D. Dana Syst. Mineral. ii. 19 This species of hemihedral Crystal has been called the inclined hemihedron.

1895 N. Story-Maskelyne Crystallogr. §137 A form of the hemi-symmetrical kind will be termed a semiform or a hemihedron.

1895 N. Story-Maskelyne Crystallogr. §176 Holo-systematic haplohedral forms; or holotesseral hemihedra.

Derivatives

hemiˈhedrism n.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > hemihedrism

hemihedrism1837

hemihedry1864

hemisymmetry1881

1837 J. D. Dana Syst. Mineral. ii. 19 The first species of hemihedrism gives rise to solids, whose opposite planes are not parallel.

1837 J. D. Dana Syst. Mineral. ii. 19 Examples of the first kind of hemihedrism, in which half the angles of the cube are modified.

hemiˈhedry n. [compare French hémiédrie] the property or quality of crystallization in hemihedral forms.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > hemihedrism

hemihedrism1837

hemihedry1864

hemisymmetry1881

1864–72 H. Watts Dict. Chem. II. 143 This kind of hemihedry is strikingly exhibited in apatite.

1883 Nature 1 Feb. 317/1 Some remarks on hemihedry in crystals.

This entry has not yet been fully updated (first published 1898; most recently modified version published online June 2021).

单词	hemihedron
释义	hemihedronn. /hɛmɪˈhiːdrən//hɛmɪˈhɛdrən/ Etymology: < hemi- prefix 3 + Greek ἕδρα after hexahedron, etc. Compare French hémièdre. Crystallography. A form or crystal of a hemihedral type. 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 1837 J. D. Dana Syst. Mineral. ii. 19 This species of hemihedral Crystal has been called the inclined hemihedron. 1895 N. Story-Maskelyne Crystallogr. §137 A form of the hemi-symmetrical kind will be termed a semiform or a hemihedron. 1895 N. Story-Maskelyne Crystallogr. §176 Holo-systematic haplohedral forms; or holotesseral hemihedra. Derivatives hemiˈhedrism n. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > hemihedrism hemihedrism1837 hemihedry1864 hemisymmetry1881 1837 J. D. Dana Syst. Mineral. ii. 19 The first species of hemihedrism gives rise to solids, whose opposite planes are not parallel. 1837 J. D. Dana Syst. Mineral. ii. 19 Examples of the first kind of hemihedrism, in which half the angles of the cube are modified. hemiˈhedry n. [compare French hémiédrie] the property or quality of crystallization in hemihedral forms. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > hemihedrism hemihedrism1837 hemihedry1864 hemisymmetry1881 1864–72 H. Watts Dict. Chem. II. 143 This kind of hemihedry is strikingly exhibited in apatite. 1883 Nature 1 Feb. 317/1 Some remarks on hemihedry in crystals. This entry has not yet been fully updated (first published 1898; most recently modified version published online June 2021). < n.1837
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