hypotenuse
LONGEST SIDE OF A RIGHT-ANGLED TRIANGLE, THE SIDE OPPOSITE OF THE RIGHT ANGLE
Hypothenuse; Hypoteneuse; Hypotenus
[h??'p?t?nju:z, -s]
¦ noun the longest side of a right-angled triangle, opposite the right angle.
Origin
C16: via L. hypotenusa from Gk hupoteinousa (gramme) 'subtending (line)', from hupo 'under' + teinein 'stretch'.