verb (used with object), excreted, excreting.
to separate and eliminate from an organic body; separate and expel from the blood or tissues, as waste or harmful matter.

1610–20; < Latin excrētus (past participle of excernere to sift out, separate), equivalent to ex- ex-1 + crē- (perfect stem of cernere to sift) + -tus past participle suffix

excreter, noun
excretive, adjective
unexcreted, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
excrete (ɪkˈskriːt)
1.  to discharge (waste matter, such as urine, sweat, carbon dioxide, or faeces) from the body through the kidneys, skin, lungs, bowels, etc
2.  (of plants) to eliminate (waste matter, such as carbon dioxide and salts) through the leaves, roots, etc
[C17: from Latin excernere to separate, discharge, from cernere to sift]

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

1610s, from L. excret-, pp. stem of excernere (see excrement). Related: Excreted; excreting.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

excrete ex·crete (ĭk-skrēt')
v. ex·cret·ed, ex·cret·ing, ex·cretes
To eliminate waste material from the body.

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
The earthworms excrete a slightly different version of the metals, making them
  easier for plants to suck up.
And you say kidneys excrete bad stuff which is totally true.
As the fish respire, their gills excrete ammonia into the water.
Even the smallest microbe can figure out how to find food, eat, excrete and
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