Biology Question: What is Excretion?

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Just_Call_Me_Shady

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Im trying to define excretion to its proper definition but im not sure if my definition is right : "Excretion is the removal of waste by metabolism".

Please only answer if you know biology as a lot of people think its doing a number 2( feaces) when its not, thats Egestion.
 
Excretion is the process of eliminating waste products of metabolism and other non-useful materials. It is an essential process in all forms of life. It contrasts secretion, where the substance may have specific tasks after leaving the cell.

In single-celled organisms, waste products are discharged directly through the surface of the cell. Multicellular organisms utilize more complex excretory methods. Higher plants eliminate gases through the stomata, or pores, on the surface of leaves. Animals have special excretory organs.
 
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