hypotenuse
hy.pot.e.nuse also hy.poth.e.nuse \hi--'pa:t-*n-.(y)u:s, -.(y)u:z\ \-'pa:th-*n-\ n [L hypotenusa, fr. Gk hypoteinousa, fr. fem. of hypoteino-nX, prp. of hypoteinein to subtend, fr. hypo- + teinein to stretch - more at THIN : the side of a right-angled triangle that is opposite the right angle