Usually means: Twenty equilateral triangles, symmetrical polyhedron.
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We found 12 dictionaries that define the word Regular icosahedron:

General (9 matching dictionaries)
  1. regular icosahedron: Collins English Dictionary
  2. regular icosahedron: Vocabulary.com
  3. regular icosahedron: Wordnik
  4. Regular icosahedron, regular icosahedron: Dictionary.com
  5. Regular icosahedron: Wikipedia, the Free Encyclopedia
  6. regular icosahedron: Rhymezone
  7. regular icosahedron: FreeDictionary.org
  8. regular icosahedron: Mnemonic Dictionary
  9. regular icosahedron: TheFreeDictionary.com

Computing (2 matching dictionaries)
  1. regular icosahedron, Regular icosahedron: Encyclopedia

Science (1 matching dictionary)
  1. regular icosahedron: PlanetMath Encyclopedia

(Note: See regular_icosahedrons as well.)

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Definitions from Wikipedia (Regular icosahedron)

▸ noun:  In geometry, the regular icosahedron (or simply icosahedron) is a convex polyhedron that can be constructed from pentagonal antiprism by attaching two pentagonal pyramids with regular faces to each of its pentagonal faces, or by putting points onto the cube.


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