trihedral adjective & noun. [trʌɪ'hi:dr(ǝ)l, -'hɛdr(ǝ)l] Also triedral. L18.
[from Greek tri- TRI- + hedra base + -AL¹.]
A. adjective. Of a solid figure or body: having three sides or faces (in addition to the base or ends); bounded laterally by three surfaces; triangular in cross-section. L18.
trihedral angle, trihedral quoin a solid angle formed by three surfaces meeting at a point.
b. noun. Geometry. A trihedral figure. E20.

■ trihedron noun, pl. -dra, -drons, = TRIHEDRAL noun E19.

[TahlilGaran] English Dictionary ▲