hemidomen.
/ˈhɛmɪdəʊm/ Crystallography.
A pair of parallel and equal faces, parallel to the orthodiagonal in the monoclinic (or monosymmetrical) system (in which two such pairs constitute a dome).
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hemiprism1864
hemidome1868
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1868 J. D. Dana Syst. Mineral. (ed. 5) Introd. 27 Monoclinic System..The domes parallel to the orthodiagonal are hemidomes, the planes in front at top being unlike in inclination those in front below, each being a hemidome.
1879 F. Rutley Study of Rocks x. 88 When the light falls obliquely either on the basal plane..or the hemidome of a monoclinic felspar.
Derivatives
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hemidoˈmatic adj. of or pertaining to a hemidome.
This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2022).
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n.1868