From The Collaborative International Dictionary of English v.0.48:
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.
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To defecate the dark and muddy oil of amber.
--Boyle.
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2. To free from extraneous or polluting matter; to clear; to
purify, as from that which materializes.
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We defecate the notion from materiality. --Glanvill.
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Defecated from all the impurities of sense. --Bp.
Warburton.
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