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prismoid
CIDE DICTIONARY
prismoid, n. [Cf. F. prismtoïde.].
A body that approaches to the form of a prism. [1913 Webster]
OXFORD DICTIONARY
prismoid, n. a body like a prism, with similar but unequal parallel polygonal ends.
Derivative
prismoidal adj.
For further exploring for "prismoid" in Webster Dictionary Online