a. [ L. erraticus, fr. errare to wander: cf. F. erratique. See Err. ] 1. Having no certain course; roving about without a fixed destination; wandering; moving; -- hence, applied to the planets as distinguished from the fixed stars. [ 1913 Webster ]

The earth and each erratic world. Blackmore. [ 1913 Webster ]

2. Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct. [ 1913 Webster ]

3. Irregular; changeable. “Erratic fever.” Harvey. [ 1913 Webster ]

Erratic blocks,
gravel, etc. (Geol.), 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. [ 1913 Webster ]

n. 1. One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character. [ 1913 Webster ]

2. A rogue. [ Obs. ] Cockeram. [ 1913 Webster ]

3. (Geol.) Any stone or material that has been borne away from its original site by natural agencies; esp., a large block or fragment of rock; a bowlder. [ 1913 Webster ]

☞ In the plural the term is applied especially to the loose gravel and stones on the earth's surface, including what is called drift. [ 1913 Webster ]

a. Erratic. -- Er*rat"ic*al*ly, adv. -- Er*rat"ic*al*ness, n. [ 1913 Webster ]