1. SYN: eccentric (1). 2. Denoting symptoms that vary in intensity, frequency, or location. [L. erro, pp. erratus, to wander]
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er·rat·ic ir-'at-ik adj
1) characterized by lack of consistency, regularity, or uniformity <an \erratic pulse>
2) deviating from what is ordinary or standard
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er·rat·ic (ə-ratґik) [L. errare to wander] 1. roving or wandering. 2. eccentric; deviating from an accepted course of thought or conduct.Medical dictionary. 2011.