| 单词 | tetrahedron |
| 释义 | tetrahedron /te'treuh hee"dreuhn/, n. , pl. tetrahedrons, tetrahedra /-dreuh/. 1. Geom. a solid contained by four plane faces; a triangular pyramid. 2. any of various objects resembling a tetrahedron in the distribution of its faces or apexes. [1560-70; TETRA- + -HEDRON, modeled on LGk tetráedron, n. use of neut. of tetráedros four-sided] |
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