pentahedron

American  

[pen-tuh-hee-druhn] / ˌpɛn təˈhi drən /

noun

pentahedrons, plural pentahedra plural

1. a solid figure having five faces.

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pentahedron British  

/ ˌpɛntəˈhiːdrən /

noun

1. a solid figure having five plane faces See also polyhedron

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Other Word Forms

Derived Forms

• pentahedral
  adjective

Inflected Forms

Nouns

• pentahedra
  plural
• pentahedrons
  plural

Etymology

Origin of pentahedron

First recorded in 1655–65; penta- + -hedron

Example Sentences

See Examples For:

pentahedron pentahedrons

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

From "Where Angels Fear to Tread" and Other Stories of the Sea by Robertson, Morgan

So trihedrons, tetrahedrons, pentahedrons, &c., though some say, these last may end in dra, which I think improper.

From The Grammar of English Grammars by Brown, Goold