The act or process of discharging waste matter from the blood, tissues, or organs.(noun)
The matter, such as urine or sweat, that is so excreted.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "excretion" in a sentence
"Anything about excretion is a huge hit with my boys."
"The last one brings its own problems though: the current record from ingestion to excretion is about forty minutes."
"The terms excretion and elimination are frequently used to describe the same process whereby a substance leaves the body."