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Definition of excretion : 1. That which is excreted; excrement.
2. The act of excreting.

Synonyms:

excrement, accretion, eating, reasoning by elimination, excretory product, purgation, sweating, riddance, liquidation, defecation, keep, voidance, excreta, emptying, body waste, feces, perspiration, catharsis, voiding, excreting

elimination, extravasation, discharge, transudation, evacuation, ejaculation, effusion, secretion, emission, exudation

expulsion, eruption, rejection, seepage, ejection, exhaustion, drainage, disgorgement

Usage examples:

• Thus, unusual cerebral excitement affects the excretion through the kidneys in quantity or quality or both. - "Essays: Scientific, Political, & Speculative, Vol. I", Herbert Spencer.
• They are carried by the blood until removed by the organs of excretion. - "Physiology and Hygiene for Secondary Schools", Francis M. Walters, A.M..
• These compounds are carried by the blood to the organs of excretion, where they are removed from the body. - "Physiology and Hygiene for Secondary Schools", Francis M. Walters, A.M..