- quadruplet, quad - one of four children born at the same time from the same pregnancy
--1 is a kind of sibling, sib
- quadriceps, quadriceps femoris, musculus quadriceps femoris, quad - a muscle of the thigh that extends the leg
--2 is a kind of extensor muscle, extensor
--2 is a part of thigh - quad, space - (printing) a block of type without a raised letter; used for spacing between words
--3 is a kind of type
--3 has particulars: hair space - quad, quadrangle - a rectangular area surrounded on all sides by buildings
--4 is a kind of area