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Webster 1913 Edition

(prĭz′moid)

Noun.

[Cf. F.

prismtoïde

A body that approaches to the form of a prism.

Noun.

[L. prisma and Gr. form.]

A body that approaches to the form of a prism.

prismoid

prismoid ‎(plural prismoids)

(geometry) A prismatoid that has planar sides, and the same number of vertices in both of its parallel planes.
(geometry) An antiprism.