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Definition of isosceles

isosceles

/aɪˈsɑː.səˌliːz/
i · sos · ce · les
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isosceles Lexical Profile

isosceles Game Scores & Validity

• adjective

1

Having two sides of equal length, used especially of a geometric triangle or trapezoid.

Example

"Because the two base angles of an isosceles triangle are equal, students can easily calculate the measure of the remaining vertex angle."

Antonyms
View all antonyms for isosceles

• Nearby Words

isometrics
isoplexis
isopod
isosceles
isotoma
isotonic
israel

Word Origin & Etymology

Borrowed via Late Latin from Ancient Greek isoskelēs, literally meaning 'equal-legged,' formed from isos ('equal') and skelos ('leg').

Cite this Entry

Wordmom. (2026). Definition of Isosceles. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/isosceles
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