spasm

spasm   (spāz'əm)    n.   A sudden, involuntary contraction of a muscle or group of muscles. A sudden burst of energy, activity, or emotion. [Middle English spasme, from Old French, from Latin spasmus, from Greek spasmos, from spān, to pull.]

Main Entry: spasm
Pronunciation: 'spaz-&m
Function: noun
1 : an involuntary and abnormal contraction of muscle or muscle fibers or of a holloworgan (as an artery, the colon, or the esophagus) that consists largely of involuntary muscle fibers
2 : the state or condition of a muscle or organ affected with spasms spasm>

spasm (spāz'əm)
n.

1. A sudden involuntary contraction of a muscle or group of muscles.

2. A muscle spasm.