| 释义 |
prismatoid, a. and n.|ˈprɪzmətɔɪd|
[ad. Gr. πρισµατοειδής prism-shaped, f. πρισµατο-: see prec. and -oid. So mod.F. prismatoïde.]
A. adj. Cryst. Applied to any plane, in a crystallographic system, parallel to one of the three axes of co-ordinates and intersecting the other two; so called because a group of eight such planes would form a prism. Opposed to octahedrid and pinakoid.
1858Mayne Expos. Lex., Prismatoides.., Mineral., resembling a prism; applied to a single cleavage face that is parallel to the axis: prismatoid; also erroneously translated prismatoidal. 1895Story-Maskelyne Crystallogr. ii. §18.
B. n. Geom. A solid figure having parallel polygonal ends connected by triangular sides.
1890in Cent. Dict. |