quadri-, quadra-, quad-, quadru-

(Latin: four, fourth; a word element for number 4)

quadraplegia
quadraplegic
quadrat
quadrate
quadratic
quadratics
quadrature
quadrennial
quadrennially
quadrennium (s), quadrennia (pl)
quadric
quadricentennial
Relating to a 400th anniversary.
quadriceps (s) (noun), quadriceps
A muscle of the thigh that extends the leg: "The quadriceps may refer to any four-headed muscle; however, it usually indicates that the quadriceps muscle of the thigh, the large muscle that comes down the femur (the bone of the upper leg), goes over the patella (the kneecap) and anchors into the top of the tibia (the big bone in the lower leg). The function of the quadriceps is to extend or to straighten out each leg."

"In Latin, this muscle's full formal name is musculus quadriceps femoris."

quadricostate
Having four costae or ribs.
quadricycle

Cross references of word families that are related, partially or totally, to: "four, fourth": quatr-; tessara-; tetra-.