[1] : The Collaborative International Dictionary of English v.0.48

erratic \errat"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.
      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
see also:
err erratic blocks gravel, etc. erratic phenomena 

Phenomena >> P Words
Phenomena, definition of term: Phenomena
phenomena_pag1.html

Erratic >> E Words
Erratic, definition of term: Erratic
erratic_pag1.html