muscle

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A tissue composed of fibers capable of contracting to effect bodily movement.
• noun A contractile organ consisting of a special bundle of muscle tissue, which moves a particular bone, part, or substance of the body.
• noun Muscular strength.
• noun Informal Power or authority.
• intransitive verb To make one's way by or as if by force.
• intransitive verb To move or force with strength.

from The Century Dictionary.

• noun See mussel.
• noun 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.”
• noun A certain portion of muscle or muscular tissue, having definite position and relation with surrounding parts, and usually fixed at one or both ends.
• noun A part, organ, or tissue, of whatever histological character, which has the property of contractility, and is thus capable of motion in itself.
• noun Figuratively, muscular strength; brawn: as, a man of muscle.
• noun See the adjectives.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To compel by threat of force.
• transitive verb To moved by human force.
• noun An organ which, by its contraction, produces motion.
• noun The contractile tissue of which muscles are largely made up.
• noun colloq. Muscular strength or development.
• noun (Zoöl.) See Mussel.
• noun An essential part of something.
• noun slang Bodyguards or other persons hired to provide protection or commit violence.
• noun (Physiol.) contraction curve of a muscle; a myogram; the curve inscribed, upon a prepared surface, by means of a myograph when acted upon by a contracting muscle. The character of the curve represents the extent of the contraction.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun uncountable A contractile form of tissue which animals use to effect movement.
• noun countable An organ composed of muscle tissue.
• noun uncountable, usually plural A well-developed physique, in which the muscles are enlarged from exercise.
• noun uncountable, figuratively Strength.
• noun uncountable Hired strongmen or bodyguards.
• verb To use force to make progress, especially physical force.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun authority or power or force (especially when used in a coercive way)
• noun animal tissue consisting predominantly of contractile cells
• noun possessing muscular strength
• noun one of the contractile organs of the body
• noun a bully employed as a thug or bodyguard
• verb make one's way by force