spasm [spaz-uh m] /ˈspæz əm/ Show IPA
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.
1350–1400; Middle English spasme < Latin spasmus < Greek spasmós convulsion, derivative of spân to draw a sword or cord, wrench (off), convulse
2. fit, storm, flash, spurt.