| spasm | (noun) (pathology) sudden constriction of a hollow organ (as a blood vessel) | - |
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| (noun) a painful and involuntary muscular contraction | Synonyms: cramp, muscle spasm |
| spasmodic | (adjective) occurring in spells and often abruptly | Synonyms: fitful |
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| (adjective) affected by involuntary jerky muscular contractions; resembling a spasm | Synonyms: convulsive, spastic |
| spasmodically | (adverb) in spurts and fits | - |
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| (adverb) with spasms | Synonyms: jerkily |
| spasmolysis | (noun) the relaxation or relief of muscle spasms | - |
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| spasmolytic | (noun) a drug used to relieve or prevent spasms (especially of the smooth muscles) | Synonyms: antispasmodic, antispasmodic agent |
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| spastic | (adjective) relating to or characterized by spasm | - |
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| (adjective) suffering from spastic paralysis | - |
| (adjective) affected by involuntary jerky muscular contractions; resembling a spasm | Synonyms: convulsive, spasmodic |
| (noun) a person suffering from spastic paralysis | - |
| spasticity | (noun) the quality of moving or acting in spasms | - |
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