A solid figure contained by four plane triangular faces, a triangular pyramid; spec. the regular tetrahedron, the first of the five regular…
| 单词 | θ98595 |
| 释义 | the world > space > shape > angularity > specific angular shape > [noun] > triangle > figure made up of triangles > pyramid > specific (3) tetrahedron1570 A solid figure contained by four plane triangular faces, a triangular pyramid; spec. the regular tetrahedron, the first of the five regular… trihedron1828 = B. trihedral1889 A trihedral figure; the figure determined by three planes meeting at a point (Cent. Dict. Suppl. 1909). |
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