quad, tetra

four

Spelled quad, tetra · quattuor 'four' (Latin); tetra 'four' (Greek)

Latin quattuor and Greek tetra mean four: a quadruped walks on four feet, a quadrilateral has four sides, and quadruple makes fourfold.

Words built from it

quadrant — one of four quarters of a plane or circle
quad (four) + -ant (part of)
quadruple — four times as much or as many
quad (four) + -uple (multiplied)
quadrilateral — a four-sided polygon
quad (four) + later (side)
quadruped — an animal that walks on four feet
quad (four) + ped (foot)
quadrangle — a four-sided courtyard or figure
quad (four) + angle (corner)
quadratic — involving a variable raised to the second power
quad (four) + -atic (relating to)