n. A muscle having four heads, especially the large extensor at the front of the thigh.
the GNU version of the Collaborative International Dictionary of English
n. The great extensor muscle of the knee, divided above into four parts which unite in a single tendon at the knee.
The Century Dictionary and Cyclopedia
n. In anatomy, the quadriceps extensor cruris of the thigh; the great muscle which extends the leg upon the thigh, considered as consisting of the rectus, cruræus, and vastus internus and externus.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a muscle of the thigh that extends the leg
Word Usage
"The quadriceps is the big muscle in the front of your thigh."