Wandering; having no certain course; roving about without a fixed destination.Deviating from the proper or usual course in opinion or conduct; eccentric.Moving; not fixed or stationary: applied to the planets as distinguished from the fixed stars.In medicine, irregular; changeable; moving from point to point, as rheumatic or other pains, or appearing at indeterminate intervals, as some intermittent fevers.In geology, relating to or explanatory of the condition and distribution of erratics. See II., 2.n. One who or that which has wandered; a wanderer.n. Specifically In geology, a boulder or block which has been conveyed from its original site, probably by ice, and deposited at a distance; an erratic block. See erratic blocks, under I.n. An eccentric person.In zoology, occurring in an unusual location.