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.
Origin of spasm
1350–1400;Middle Englishspasme < Latinspasmus < Greekspasmós convulsion, derivative of spân to draw a sword or cord, wrench (off), convulse
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.