The side of a right triangle opposite the right angle.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "hypotenuse" in a sentence
"The word hypotenuse in Greek originally meant “stretched against”."
"This is called a hypotenuse, which we learned yesterday in math."
"The hypotenuse already has a name, albeit a lengthy one, so we’ll keep that, except we will capitalize it to distinguish the name of our particular line, Hypotenuse, from the term the hypotenuse."