Usually means: Four triangular faces polyhedral shape.
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We found 11 dictionaries that define the word tetrahedra:

General (10 matching dictionaries)
  1. tetrahedra: Merriam-Webster
  2. tetrahedra: Oxford Learner's Dictionaries
  3. tetrahedra: Collins English Dictionary
  4. tetrahedra: Vocabulary.com
  5. tetrahedra: Wordnik
  6. tetrahedra: Cambridge Advanced Learner's Dictionary
  7. tetrahedra: Wiktionary
  8. tetrahedra: Dictionary.com
  9. Tetrahedra: Wikipedia, the Free Encyclopedia
  10. tetrahedra: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. tetrahedra: Encyclopedia

(Note: See tetrahedron as well.)

Definitions from Wiktionary (tetrahedron)

noun:  (geometry) A polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.
▸ Also see tetrahedron

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