spasm

spasm is a   Noun

Definition:

[1] An involuntary and unnatural contraction of one or more muscles or muscular fibers.

[2] A sudden, violent, and temporary effort or emotion; as, a spasm of repentance. Cynic spasm (Med.) See under Cynic. -- Spasm of the chest. See Angina pectoris, under Angina.

Synonyms: