We found 19 dictionaries that define the word equilateral triangle:

General (12 matching dictionaries)

1. equilateral triangle: Merriam-Webster
2. equilateral triangle: Vocabulary.com
3. equilateral triangle: Wiktionary
4. equilateral triangle: Dictionary.com
5. Equilateral triangle: Wikipedia, the Free Encyclopedia
6. equilateral triangle: Rhymezone
7. equilateral triangle: FreeDictionary.org
8. equilateral triangle: Mnemonic Dictionary
9. equilateral triangle: TheFreeDictionary.com
10. equilateral triangle: Longman Dictionary of Contemporary English

Business (1 matching dictionary)

11. Construction Term Glossary (No longer online)

Computing (1 matching dictionary)

12. equilateral triangle: Encyclopedia

Miscellaneous (1 matching dictionary)

13. Encyclopedia of Graphic Symbols (No longer online)

Science (3 matching dictionaries)

14. A Glossary of Mathematical Terms (No longer online)
15. Equilateral Triangle: Eric Weisstein's World of Mathematics
16. equilateral triangle: PlanetMath Encyclopedia

Slang (1 matching dictionary)

17. Equilateral Triangle: Urban Dictionary

(Note: See equilateral_triangles as well.)

Definitions from Wiktionary (equilateral triangle) ▸ noun:  (geometry) A triangle having all three sides equal. Similar: equiangular triangle, triangle, Golden Triangle, threeside, rectangle, trisection, square, Pythagorean triangle, triforce, septangle, more... Opposite: scalene, unequal-sided, asymmetrical ▸ Words similar to equilateral triangle ▸ Usage examples for equilateral triangle ▸ Idioms related to equilateral triangle ▸ Wikipedia articles (New!) ▸ Words that often appear near equilateral triangle ▸ Rhymes of equilateral triangle ▸ Invented words related to equilateral triangle