1. a figure formed by three planes meeting at a point
Usage: geometry

Examples

• The corner of a cube forms a trihedron where three faces meet.
• In solid geometry, a trihedron is defined by three intersecting planes.
• The mathematician studied the angles of the trihedron.
• Each vertex of a tetrahedron creates a trihedron.
• The trihedron’s three dihedral angles must sum to less than 360 degrees.