We found 28 dictionaries that define the word icosahedron:

General (20 matching dictionaries)

1. icosahedron: Merriam-Webster
2. icosahedron: Oxford Learner's Dictionaries
3. icosahedron: American Heritage Dictionary of the English Language
4. icosahedron: Collins English Dictionary
5. icosahedron: Vocabulary.com
6. icosahedron: Wordnik
7. icosahedron: Wiktionary
8. icosahedron: Webster's New World College Dictionary, 4th Ed.
9. icosahedron: The Wordsmyth English Dictionary-Thesaurus
10. icosahedron: Infoplease Dictionary
11. icosahedron: Dictionary.com
12. Icosahedron: Wikipedia, the Free Encyclopedia
13. Icosahedron: Online Plain Text English Dictionary
14. icosahedron: Webster's Revised Unabridged, 1913 Edition
15. icosahedron: Rhymezone
16. Icosahedron: AllWords.com Multi-Lingual Dictionary
17. icosahedron: Webster's 1828 Dictionary
18. icosahedron: FreeDictionary.org
19. icosahedron: Mnemonic Dictionary
20. icosahedron: TheFreeDictionary.com

Art (1 matching dictionary)

21. icosahedron: ArtLex Lexicon of Visual Art Terminology

Computing (1 matching dictionary)

22. icosahedron: Encyclopedia

Medicine (3 matching dictionaries)

23. online medical dictionary (No longer online)
24. Microbial Genetics Glossary (No longer online)
25. icosahedron: Medical dictionary

Science (2 matching dictionaries)

26. Icosahedron: Eric Weisstein's World of Mathematics
27. icosahedron, icosahedron: PlanetMath Encyclopedia

Slang (1 matching dictionary)

28. Icosahedron: Urban Dictionary

(Note: See icosahedra as well.)

Definitions from Wiktionary (icosahedron) ▸ noun:  (geometry) A polyhedron with twenty faces. ▸ noun:  (geometry, specifically) A regular icosahedron: one of the Platonic solids, all of whose faces are regular (equilateral) triangles Similar: icosaedron, icosaedrum, icosihenagon, eicosaedrum, didodecahedron, octakishexahedron, great icosihemidodecahedron, enneadecahedron, truncated icosahedron, icosidodecahedron, more... Opposite: dodecahedron, tetrahedron, cube Types: pentagonal, triangular, hexagonal, hexahedron, octahedron, dodecahedron, more... Phrases: Regular icosahedron, truncated icosahedron, great icosahedron, Triakis icosahedron, Final stellation of the icosahedron, more... Adjectives: regular, truncated, spherical, great, rhombic, double, atom, sided, perfect, distorted, stellated ▸ Words similar to icosahedron ▸ Usage examples for icosahedron ▸ Idioms related to icosahedron ▸ Wikipedia articles (New!) ▸ Popular adjectives describing icosahedron ▸ Words that often appear near icosahedron ▸ Rhymes of icosahedron ▸ Invented words related to icosahedron