直角三角形之斜边
Hypotenuse \Hy*pot"e*nuse\, Hypothenuse \Hy*poth"e*nuse\, n. [L. hypotenusa, Gr. ?, prob., subtending (sc. ?), fr. ? to stretch under, subtend; ? under + ? to stretch. See {Subtend}.] (Geom.) The side of a right-angled triangle that is opposite to the right angle.
hypotenuse n : the side of a right triangle opposite the right angle