hy ‧ pot ‧ e ‧ nuse /haɪˈpɒtənjuːz, haɪˈpɒtɪnjuːz $ -ˈpɑːt ə nuːs, -nuːz/ BrE AmE noun [countable] technical
[ Date: 1500-1600 ; Language: Latin ; Origin: hypotenusa , from Greek , from hypoteinein 'to stretch under' ]
the longest side of a ↑ triangle that has a ↑ right angle