n. A kind of animal tissue consisting of bundles of fibers whose essential physiological characteristic is contractility, or the capability of contracting in length and dilating in breadth on the application of a proper stimulus, as the impulse of a motor nerve, or a shock of electricity; flesh; “lean meat.”n. A certain portion of muscle or muscular tissue, having definite position and relation with surrounding parts, and usually fixed at one or both ends.n. A part, organ, or tissue, of whatever histological character, which has the property of contractility, and is thus capable of motion in itself.n. Figuratively, muscular strength; brawn: as, a man of muscle.n. See the adjectives.n. See mussel.