Definition of excretion noun from the Oxford Advanced Learner's Dictionary

 

excretion

 noun
noun
BrE BrE//ɪkˈskriːʃn//
 
; NAmE NAmE//ɪkˈskriːʃn//
 
[uncountable, countable](specialist)
 
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the act of passing solid or liquid waste matter from the body; the solid or liquid waste matter that is passed in this way the excretion of toxic substances through the skin It's the corals' excretions that become the scaffolding of coral reefs.