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From Biology-Online Dictionary | Biology-Online Dictionary
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1. Having no certain course; roving about without a fixed destination; wandering; moving; hence, applied to the planets as distinguished from the fixed stars. The earth and each erratic world. (Blackmore)

2. Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct.

3. Irregular; changeable. Erratic fever. erratic blocks, gravel, etc.

(Science: geology) masses of stone which have been transported from their original resting places by the agency of water, ice, or other causes. Erratic phenomena, the phenomena which relate to transported materials on the earth's surface.

Origin: L. Erraticus, fr. Errare to wander: cf. F. Erratique. See Err.

1. One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character.

2. A rogue.

3. (Science: geology) Any stone or material that has been borne away from its original site by natural agencies; especially, a large block or fragment of rock; a bowlder.

in the plural the term is applied especially to the loose gravel and stones on the earth's surface, including what is called drift.