[1] : The Collaborative International Dictionary of English v.0.48

quadriceps \quad"riceps\, n. nl., fr. l. qyattuor four + caput
   head. anat.
   the great extensor muscle of the knee, divided above into
   four parts which unite in a single tendon at the knee.
   1913 webster

[2] : WordNet (r) 2.0

quadriceps
     n : a muscle of the thigh that extends the leg syn: quadriceps
         femoris, musculus quadriceps femoris, quad
see also:
quadriceps femoris musculus quadriceps femoris quad 

Quadriceps >> Q Words
Quadriceps, definition of term: Quadriceps
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