单词	tetrahedron
释义	tet·ra·he·dron \ˌ ̷ ̷ ̷ ̷ˈhē]drən sometimes ]ˌdrän or chiefly Brit ˈhe]\ noun (plural tetrahedrons or tetrahe·dra \-drə\) Etymology: New Latin, from Late Greek tetraedron, neuter of tetraedros having four faces, from Greek tetra- + hedra seat, face — more at sit 1. : a polyhedron of four faces 2. : an object having the form of or suggesting a tetrahedron: as  a. : caltrop 2a  b. : three logs or lengths of steel bolted or lashed together and used as an obstacle  c. : a large concrete block of tetrahedral shape used especially in constructing or strengthening revetments — compare tetrapod 3  d. : a large wind-indicating device used on airfields and consisting of a frame covered with airplane cloth and pivoted so that the pointed end indicates the wind direction
随便看	guaraguao guarana guarani guarani guarani guaranian guaranoca guarantee guarantee guaranteed guaranteed annual wage guaranteed bond guaranteed rate guaranteed stock guaranteed value guaranteed wage guarantor guaranty guaranty guaraní guaras guarauno guarayo guarayu guarayú

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