Main Entry: spasm

Pronunciation: \ˈspaz-əm\

Function: noun

1 : an involuntary and abnormal contraction of muscle or muscle fibers or of a hollow organ (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 <the renal artery went into spasm>