ex·tra·sys·to·le ( k str -s s t-l )n. A premature contraction of the heart, resulting in momentary cardiac arrhythmia. ex tra·sys·tolic (-s-st lk) adj. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | extrasystole - a premature systole resulting in a momentary cardiac arrhythmia systole - the contraction of the chambers of the heart (especially the ventricles) to drive blood into the aorta and pulmonary artery |
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