quadricep

This term is used primarily in medical, athletic, and fitness contexts to refer to the large muscle group on the front of the thigh. While technically a group of four muscles, it is frequently treated as a single anatomical unit in common parlance.

In casual conversation, the word is often shortened to "quads," which is almost always used in the plural to refer to both legs or the collective muscle group. In a clinical setting, "quadricep" may be used in the singular to specify a particular injury or a specific muscle within the group.