† prismatidadj.n.

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek πρισματ- , πρῖσμα , -id suffix².

Etymology: < ancient Greek πρισματ-, πρῖσμα prism n. + -id suffix². Compare earlier prismatoid adj., prismatoidal adj. N.E.D. (1908) gives the pronunciation as (pri·zmătid) /ˈprɪzmətɪd/.

Crystallography. Obsolete. rare.

A. adj.

Designating a crystalline form consisting of three or more faces parallel to an axis. Cf. prism n. 5.

ΚΠ

1895 N. Story-Maskelyne Crystallogr. vii. §302 The designations of..the horizontal prismatid forms as domes, the vertical one as a prism, have already been given in article 109.

B. n.

A crystalline form of this kind.

ΚΠ

1895 N. Story-Maskelyne Crystallogr. vii. §328 Among the varieties of prismatids, of which the poles always lie in a zone perpendicular to the zone-circle of symmetry, two are especially noticeable.

This entry has been updated (OED Third Edition, June 2007; most recently modified version published online June 2020).

单词	prismatid
释义	† prismatidadj.n. Origin: A borrowing from Greek, combined with an English element. Etymons: Greek πρισματ- , πρῖσμα , -id suffix². Etymology: < ancient Greek πρισματ-, πρῖσμα prism n. + -id suffix². Compare earlier prismatoid adj., prismatoidal adj. N.E.D. (1908) gives the pronunciation as (pri·zmătid) /ˈprɪzmətɪd/. Crystallography. Obsolete. rare. A. adj. Designating a crystalline form consisting of three or more faces parallel to an axis. Cf. prism n. 5. ΚΠ 1895 N. Story-Maskelyne Crystallogr. vii. §302 The designations of..the horizontal prismatid forms as domes, the vertical one as a prism, have already been given in article 109. B. n. A crystalline form of this kind. ΚΠ 1895 N. Story-Maskelyne Crystallogr. vii. §328 Among the varieties of prismatids, of which the poles always lie in a zone perpendicular to the zone-circle of symmetry, two are especially noticeable. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online June 2020). < adj.n.1895
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