English-Thai Dictionary
tetrahedron
N รูปทรง สี่ หน้า
Webster's 1828 Dictionary
TETRAHEDRON
n.[Gr. four, and side. ] In geometry, a figure comprehended under four equilateral and equal triangles; or one of the five regular Platonic bodies of that figure.
Webster's 1913 Dictionary
TETRAHEDRON
Tet `ra *he "dron, n. Etym: [Tetra- + Gr. (Geom.)
Defn: A solid figure inclosed or bounded by four triangles.
Note: In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron. Regular tetrahedron (Geom.), a solid bounded by four equal equilateral triangles; one of the five regular solids.
New American Oxford Dictionary
tetrahedron
tet ra he dron |ˌtetrəˈhēdrən ˌtɛtrəˈhidrən | ▶noun ( pl. tetrahedra |-drə | or tetrahedrons ) a solid having four plane triangular faces; a triangular pyramid. DERIVATIVES tet ra he dral |-drəl |adjective ORIGIN late 16th cent.: from late Greek tetraedron, neuter (used as a noun ) of tetraedros ‘four-sided. ’
Oxford Dictionary
tetrahedron
tetrahedron |ˌtɛtrəˈhiːdrən, -ˈhɛd -| ▶noun ( pl. tetrahedra |-drə | or tetrahedrons ) a solid having four plane triangular faces; a triangular pyramid. DERIVATIVES tetrahedral adjective ORIGIN late 16th cent.: from late Greek tetraedron, neuter (used as a noun ) of tetraedros ‘four-sided ’.
Sanseido Wisdom Dictionary
tetrahedron
tet ra he dron /tètrəhíːdr (ə )n, -hé -/名詞 複 ～s, -dra /-drə /C 四面体 .
The Wordsmith Dictionary