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spasm (n.)

late 14c., "sudden violent muscular contraction," from Old French spasme (13c.) and directly from Latin spasmus "a spasm," from Greek spasmos "a spasm, convulsion," from span "draw up, tear away, contract violently, pull, pluck," from PIE *spe- "stretch." Figurative sense of "a sudden convulsion" (of emotion, politics, etc.) is attested from 1817.

spasm (v.)

1900, from spasm (n.). Related: Spasmed; spasming.

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Definitions of spasm from WordNet

spasm (n.)
a painful and involuntary muscular contraction;
Synonyms: cramp / muscle spasm
spasm (n.)
(pathology) sudden constriction of a hollow organ (as a blood vessel);
From wordnet.princeton.edu