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Combining form:
quadri-
Four
Encyclopedia:
Quadri-
quadrasonic
quadrat
quadrate
quadratic
quadratic equation
quadratic polynomial
quadratics
quadrature
quadrennial
quadrennium
quadri-
quadric
quadric surface
quadriceps
quadriceps femoris
quadriga
Quadrigesima Sunday
quadrilateral
quadrille
quadrillion
quadrillionth