Webster's English Dictionary

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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