'Triedral' definitions:
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Triedral \Tri*e"dral\, a.
See Trihedral.
[1913 Webster]
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Trihedral \Tri*he"dral\, a. [See Trihedron.] (Geom.)
Having three sides or faces; thus, a trihedral angle is a
solid angle bounded by three plane angles. [Written also
triedral.]
[1913 Webster]