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decahedron

In geometry, a solid, three-dimensional shape with ten sides is called a decahedron.

In real life, you're most likely to come across a decahedron in the form of a glass or crystal prism. The next time you see one hanging in a window, reflecting rainbows on the wall, count the number of faces, or smooth sides — if there are ten, it's a decahedron. The word comes from Greek roots deka, ten, and hedra, "base" or "face of a geometric solid."

Definitions of decahedron
  1. noun
    any polyhedron having ten plane faces
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    type of:
    polyhedron
    a solid figure bounded by plane polygons or faces
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