| Word | Definitions | Synonyms |
|---|---|---|
| extrasystole | (noun) a premature systole resulting in a momentary cardiac arrhythmia | - |
| idiosyncrasy | (noun) a behavioral attribute that is distinctive and peculiar to an individual | Synonyms: foible, mannerism |
| parasympathetic | (noun) originates in the brain stem and lower part of the spinal cord; opposes physiological effects of the sympathetic nervous system: stimulates digestive secretions; slows the heart; constricts the pupils; dilates blood vessels | Synonyms: parasympathetic nervous system |