tetrahedron
/ˌtetrəˈhedrən/noun
(pl. tetrahedra /-drə/ 或tetrahedrons)
- a solid having four plane triangular faces; a triangular pyramid四面体。
派生词
tetrahedral
adjective词源
late 16th cent.: from late Greek tetraedron, neuter (used as a noun) of tetraedros 'four-sided'.