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hemihedron

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hemihedron
hemihedron Cryst. (hɛmɪˈhiːdrən, -ˈhɛdrən) [f. hemi- c + Gr. ἕδρα after hexahedron, etc. Cf. F. hémièdre.] A form or crystal of a hemihedral type.1837 Dana Min. ii. 19 This species of hemihedral Crystal has been called the inclined hemihedron. 1895 Story-Maskelyne Crystallogr. §137 A form of the hem... Oxford English Dictionary
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hemihedral
hemihedral, a. Cryst. (hɛmɪˈhiːdrəl, -ˈhɛdrəl) Also hemiedral. [f. hemi- c + Gr. ἕδρα seat, base + -al.] Of a crystal: Having half the number of planes required by the highest degree of symmetry belonging to its system; thus, a tetrahedron is the hemihedral form corresponding to the holohedral octah... Oxford English Dictionary
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hemi-
hemi-, prefix (ˈhɛmɪ-, ˈhiːmɪ-) [a. Gr. ἡµι-, combining element, from earlier *σᾱµι- = L. sēmi-, Skr. sāmi-, OTeut. *sâmi-, OE. sam-, all meaning ‘half-’. Several Gr. words containing this element were in use as technical terms in later L., e.g. hēmicyclium, hēmīna, hēmisphærium, hēmistichium. In th... Oxford English Dictionary
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semi-form
▪ I. ˈsemi-form, n. [semi- 2, 7 f.] An imperfect form; Cryst., a hemihedral form.1836 Smart, Semi-form. 1895 Story-Maskelyne Crystallogr. §137 A form of the hemi-symmetrical kind will be termed a semiform or a hemihedron.▪ II. semi-form, a. rare—0. [ad. L. sēmiformis, f. sēmi- semi- + forma form n.]... Oxford English Dictionary
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