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noun, Medicine/Medical.
See under (def 1).
[spaz-uh m] /ˈspæz əm/
Pathology. a sudden, abnormal, involuntary muscular contraction, consisting of a continued muscular contraction (tonic spasm) or of a series of alternating muscular contractions and relaxations (clonic spasm)
any sudden, brief spell of great energy, activity, feeling, etc.
an involuntary muscular contraction, esp one resulting in cramp or convulsion
a sudden burst of activity, emotion, etc

c.1400, from Old French spasme, from Latin spasmus “a spasm,” from Greek spasmos “a spasm, convulsion,” from span “draw up, tear away, contract violently, pull,” from PIE *spe- “stretch.” Figurative sense of “a sudden convulsion” (of emotion, politics, etc.) is attested from 1817.

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

spasm (spāz’əm)

clonic spasm n.
Alternate involuntary contraction and relaxation of a muscle.


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