Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.

from The Century Dictionary.

  • noun A prismatoid whose base and top have the same number of sides, and every corresponding pair parallel. See prismatoid, 1.
  • noun A body that approaches to the form of a prism; a prismatoid.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A body that approaches to the form of a prism.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[prism + –oid.]

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