\Er*rat"ic\, 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.
         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.'' --Harvey.
{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.

\Er*rat"ic\, n.
1. One who deviates from common and accepted opinions; one
   who is eccentric or preserve in his intellectual
   character.
2. A rogue. [Obs.] --Cockeram.
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.
Note: In the plural the term is applied especially to the
      loose gravel and stones on the earth's surface,
      including what is called drift.