trihedron

[ trahy-hee-druh n ]
/ traɪˈhi drən /

noun, plural tri·he·drons, tri·he·dra [trahy-hee-druh] /traɪˈhi drə/. Geometry.

the figure determined by three planes meeting in a point.
Also trihedral.

Origin of trihedron

First recorded in 1820–30; tri- + -hedron

British Dictionary definitions for trihedron

trihedron
/ (traɪˈhiːdrən) /

noun plural -drons or -dra (-drə)

a figure determined by the intersection of three planes