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abduction of a muscle, the act or process of drawing away from the main axis of the body. [1/2 definitions]
adduct to move or pull (a body part such as a muscle) toward the main axis. (Cf. abduct.)
adduction the action of a muscle that adducts. [1/3 definitions]
amyotrophic lateral sclerosis a disease that causes loss of control in muscle movement because of the degeneration of nerve cells; Lou Gehrig's disease.
anabolic steroid a synthetic hormone sometimes used by athletes to increase muscle size or strength, but widely prohibited by athletic leagues, associations, and the like.
angina pectoris severe recurrent pain in the chest caused by a sudden decrease in the amount of blood flowing to the heart muscle.
antagonist one muscle that causes movement in the opposite direction from that caused by another. [1/3 definitions]
ataxia loss or lack of ability to coordinate voluntary muscle movements.
biceps a muscle divided in two parts at its origin, esp. the large muscle at the front of the upper arm that bends the elbow.
bundle in biology, a cluster of muscle or nerve fibers. [1/6 definitions]
cerebellum the region of the brain controlling voluntary muscle coordination and balance.
charley horse a painful cramp in a muscle caused by overexertion or by a blow.
clonus a rapid succession of muscle spasms.
constrictor a muscle that constricts a cavity of the body or compresses an organ. [1/3 definitions]
contractor something, esp. a muscle, that shortens or contracts. [1/2 definitions]
convulse to cause to have involuntary spasms or muscle contractions. [1/3 definitions]
coronary insufficiency a medical condition in which the heart muscle does not receive enough oxygenated blood, resulting in angina pectoris or heart failure.
cramp1 (sometimes pl.) a painful and debilitating contraction or spasm of any muscle of the body. [2/3 definitions]
deltoid a thick, triangular muscle that covers the shoulder joint and functions to raise the arm laterally. [2/3 definitions]
diaphragm in anatomy, a wall of muscle or membranous material separating two spaces, esp. the muscle wall separating the thorax and abdomen in mammals. [1/5 definitions]
dystrophy any of various physical disorders resulting in weakening or wasting away of muscle tissue. [1/2 definitions]