Stretching out; extension; an instance of this. rare.

Anatomy and Zoology. The action of moving a part of the body away from the median plane or midline or away from another part; the condition of being…

The action or an act of cringe, v. (in various senses); esp. servile or obsequious behaviour. Also (derogatory): bowing.

spec. Physiology. The relationship between muscles or groups of muscles that act as antagonists (antagonist, n. 3) in moving a specific part of the…

The propulsive movement of the gastrointestinal tract and other tubular organs (or, rarely, organisms), consisting of coordinated waves of…

Movement produced by muscular action. Obsolete. rare.

A quivering movement in the fibrils of a muscle or nerve, esp. the muscles of the heart.

Medicine. A sudden, involuntary spasmodic or convulsive movement of the body or a part of the body; (in later use) spec. a reflex contraction of a…

Physiology and Zoology. The action of extending a part of the body, esp. by using a protractor muscle.

The action of flex, v. Also transferred.

a reflex contraction of a muscle resulting from the stretching of the same muscle.

Physiology. Uncoordinated twitching of a muscle, esp. that involving the simultaneous contraction of whole bundles or fasciculi of muscle fibres.

(Physiology), used attributively to designate the model of the action of striated muscle in which contraction results from filaments of actin and…