muscle

mus·cle

noun, often attrib \ˈməs-əl\

Definition of MUSCLE

1

: a body tissue consisting of long cells that contract when stimulated and produce motion—see cardiac muscle, smooth muscle, striated muscle

2

: an organ that is essentially a mass of muscle tissue attached at either end to a fixed point and that by contracting moves or checks the movement of a body part—see agonist 1, antagonist a, synergist 2

Illustration of MUSCLE