quarter.
[planar form with four sides] tetract†, tetragon, quadrangle,
rectangle.
[three dimensional object with four surfaces] tetrahedron.
quadrature, quadrifoil, quadriform, quadruplet; quatrefoil.
[object or animal with four legs] tetrapod.
[geographical area with four sides] quadrangle, quad [Coll.].
[electromagnetic object] quadrupole.
[four fundamental studies] quadrivium.
V. reduce to a square, square.
Adj. four; quaternary, quaternal†; quadratic; quartile; tetract†,
tetractic†, tetractinal†; tetrad, tetragonal; square, quadrate.