verb (used without object), defecated, defecating.
to void excrement from the bowels through the anus; have a bowel movement.
to become clear of dregs, impurities, etc.
verb (used with object), defecated, defecating.
to clear of dregs, impurities, etc.; purify; refine.

1565–75; < Latin dēfaecātus (past participle of dēfaecāre to cleanse, refine), equivalent to dē- de- + faec- (stem of faex dregs, sediment) + -ātus -ate1

defecation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
defecate or defaecate (ˈdɛfɪˌkeɪt)
1.  (intr) to discharge waste from the body through the anus
2.  (tr) to clarify or remove impurities from (a solution, esp of sugar)
[C16: from Latin dēfaecāre to cleanse from dregs, from de- + faex sediment, dregs]
defaecate or defaecate
[C16: from Latin dēfaecāre to cleanse from dregs, from de- + faex sediment, dregs]
defe'cation or defaecate
defae'cation or defaecate
'defecator or defaecate
'defaecator or defaecate

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1570s, "to purify," from L. defæcatus, pp. of defæcare "cleanse from dregs, purify," from the phrase de fæce "from dregs," pl. fæces "feces." Excretory sense first recorded 1830 (defecation), Amer.Eng., from French.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

defecate def·e·cate (děf'ĭ-kāt')
v. def·e·cat·ed, def·e·cat·ing, def·e·cates
To void feces from the bowels.

def'e·ca'tion n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Defecating, however, is apparently a bit less majestic.
When the animal began defecating all over the boat, the rafters managed to give
  it to their host in the next town.
Tom may want to feed the dogs where they are defecating.
We want to make defecating outside pleasant and inside unpleasant.
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