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Definitions

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

  • n. A solid having five plane faces.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A solid geometric figure with five faces.

from the GNU version of the Collaborative International Dictionary of English

  • n. A solid figure having five sides.

from The Century Dictionary and Cyclopedia

  • n. A solid figure having five faces.

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

  • n. any polyhedron having five plane faces

Etymologies

penta- + -hedron (Wiktionary)

Examples

  • Yes, he thought to himself as his eyes scanned the fascinating complex of structures, aver there is a dodecahedron, there a pentahedron ...

    Rama Revisited

  • In turn it was a sphere, a disk, a pyramid, a pentahedron, a polyhedron.

    "Where Angels Fear to Tread" and Other Stories of the Sea

  • “universe”, “prime number”; of the second kind are ideas like “nothing”, “round square”, “regular pentahedron”, “golden mountain” (empirically empty), logical particles such as

    Bolzano's Logic

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