quaternary (n.)
- biquadrate
- biquadratic
- four
- foursome
- foursquare
- quad
- quadrangle
- quadrature
- quadrennium
- quadric
- quadrilateral
- quadrille
- quadruped
- quadruplet
- quartet
- quartic
- quartile
- quatern
- quaternion
- quaternity
- rectangle
- square
- tetrad
- tetragon
- tetragram
- tetragrammaton
- tetrahedron
- tetralogy
quaternary (adj.)
- biquadratic
- four
- foursquare
- quadrilateral
- quadruped
- square
- tetravalent
