hypotenuse
/haɪˈpɒtənjuːz/noun
- the longest side of a right-angled triangle, opposite the right angle（直角三角形的）斜边。
词源
late 16th cent.: via Latin hypotenusa from Greek hupoteinousa （grammē） 'subtending (line)', from the verb hupoteinein （from hupo 'under' + teinein 'stretch'）.