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Definition of tetrahedron : A solid figure inclosed or bounded by four triangles.

Synonyms:

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

Usage examples:

• From the sides of the hollow square sprang long arms of spheres, each tipped by a tetrahedron. - "The Metal Monster", A. Merritt.
• About Mars' orbit describe a tetrahedron; the sphere containing this will be Jupiter's orbit. - "The Astronomy of Milton's 'Paradise Lost'", Thomas Orchard.
• Although Eudemus attributes all five to Pythagoras, it is certain that the tetrahedron, cube, and octahedron were known to the Egyptians, since they appear in their architectural decorations. - "The Teaching of Geometry", David Eugene Smith.