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Prismoid vs Prismoidal - What's the difference?

prismoid | prismoidal |

As a noun prismoid

is a prismatoid that has planar sides, and the same number of vertices in both of its parallel planes.

As an adjective prismoidal is

having the form of a prismoid.

prismoid

English

Noun

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

    • prismoidal

    English

    Adjective

    (en adjective)
  • Having the form of a prismoid.
    • (Webster 1913)