Source : Webster's Revised Unabridged Dictionary (1913)

Defecate \Def"e*cate\, v. t. [imp. & p. p. {Defecated}; p. pr. &
   vb. n. {Defecating}.]
   1. To clear from impurities, as lees, dregs, etc.; to
      clarify; to purify; to refine.

            To defecate the dark and muddy oil of amber.
                                                  --Boyle.

   2. To free from extraneous or polluting matter; to clear; to
      purify, as from that which materializes.

            We defecate the notion from materiality. --Glanvill.

            Defecated from all the impurities of sense. --Bp.
                                                  Warburton.