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hypotenuse (n.)

the side of a right triangle that is opposite the right angle, 1570s, from Late Latin hypotenusa, from Greek hypoteinousa "stretching under" (the right angle), fem. present participle of hypoteinein, from hypo- "under" (see hypo-) + teinein "to stretch," from PIE root *ten- "to stretch." Formerly often erroneously hypothenuse. Related: Hypotenusal.

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Definitions of hypotenuse from WordNet

hypotenuse (n.)
the side of a right triangle opposite the right angle;
From wordnet.princeton.edu