Usually means: Two sides of equal length.
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We found 23 dictionaries that define the word isosceles:

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

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (1 matching dictionary)
  1. isosceles: PlanetMath Encyclopedia

Slang (1 matching dictionary)
  1. isosceles: Urban Dictionary

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Definitions from Wiktionary (isosceles)

▸ adjective:  (geometry) Having (at least) two sides of equal length, used especially of a triangle or trapezoid.

Similar:
symmetric, symmetrical, equilateral, scalene, regular, equidissectable, æquilateral, hemiequilateral, equiregular, equisided, more...

Opposite:
scalene, unequal, asymmetrical

Types:
right, acute, obtuse, more...

Phrases:
isosceles triangle, isosceles triangles, isosceles trapezoid, isosceles trapezium, isosceles trapezoids, more...

Adjectives:
angled, right, equilateral, rectangular, equal, large, small, congruent, obtuse, acute, inverted


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Similar:
symmetric, symmetrical, equilateral, scalene, regular, equidissectable, æquilateral, hemiequilateral, equiregular, equisided, more...

Opposite:
scalene, unequal, asymmetrical

Types:
right, acute, obtuse, more...

Phrases:
isosceles triangle, isosceles triangles, isosceles trapezoid, isosceles trapezium, isosceles trapezoids, isosceles right triangle, Isosceles Stance, more...

Adjectives:
angled, right, equilateral, rectangular, equal, large, small, congruent, obtuse, acute, inverted



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