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Definition of pentahedron : A solid figure having five sides.

Synonyms:

dodecahedron, parallelogram, parallelepiped, polygon, octagon, scalene triangle, hexahedron, polyhedron, pentagon, rectangle, tetragon, hexagon, trapezoid, right-angle triangle, cube, quadrilateral, equilateral triangle, triangle, rhombus, heptagon, dodecagon, cusp, square, tetragram, quadrangle, tetrahedron, isosceles triangle, decagon, octahedron

Usage examples:

• In turn it was a sphere, a disk, a pyramid, a pentahedron, a polyhedron. - ""Where Angels Fear to Tread" and Other Stories of the Sea", Morgan Robertson.