This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A sudden, involuntary contraction of a muscle or group of muscles.

n. A sudden burst of energy, activity, or emotion.

n. A sudden, involuntary contraction of a muscle, a group of muscles, or a hollow organ.

n. A violent, excruciating seizure of pain.

n. A sudden and temporary burst of energy, activity, or emotion.

v. To produce and undergo a spasm.

n. An involuntary and unnatural contraction of one or more muscles or muscular fibers.

n. A sudden, violent, and temporary effort or emotion.

n. Excessive muscular contraction.

n. In general, any sudden transitory movement of a convulsive character, voluntary or involuntary; an abnormally energetic action or phase of feeling; a wrenching strain or effort: as, a spasm of industry, of grief, of fright, etc.; a spasm of pain or of coughing.

n. a painful and involuntary muscular contraction

n. (pathology) sudden constriction of a hollow organ (as a blood vessel)

"Muscles in spasm, cut off from ligaments and blood straining with effort to keep the heart working."

spasmed    spasming    spasms   

fit    saltatorial spasm    mimetic spasm    nictitating spasm    carpopedal    tetanic spasm    spasm of accommodation    retrocollic spasm    bronchial spasm    inspiratory spasm   

chasm    phantasm   

twinge    tremor    convulsion    surge    paroxysm    gasp    outburst    jolt    agony    ache