- spasm, cramp, muscle spasm - a painful and involuntary muscular contraction
--1 is a kind of symptom
--1 has particulars:charley horse, charley-horse; writer's cramp, graphospasm; blepharospasm; crick, rick, wrick; myoclonus; opisthotonos; twitch, twitching, vellication; tenesmus; trismus - spasm - (pathology) sudden constriction of a hollow organ (as a blood vessel)
--2 is a kind of constriction
--2 has particulars: bronchospasm; cardiospasm; heave, retch; laryngismus