Definitions

from The Century Dictionary.

  • noun An auxiliary prism; part of a compound prism placed with its refractive edge in a reversed position.

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

  • noun A polyhedron composed of two parallel copies of some particular polygon, connected by an alternating band of triangles.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

anti- +‎ prism

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Examples

  • But math-crazy Lovecraft would have known that a trapezohedron is an "antiprism."

    Kenneth Hite's Journal princeofcairo 2007

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