• (n.) The act or process of depurating or freeing from foreign or impure matter, as a liquid or wound.
The process of removing pathogens from shellfish by keeping them in clean water for a period of time prior to sale.
Purification; removal of waste products or foul excretions. ... (05 Mar 2000) ... 
Dep`u·ra'tion noun [ Confer French dépuration .] The act or process of depurating or freeing from foreign or impure matter, as a liquid or wound. 
Type: Term Pronunciation: dep′yū-rā′shŭn Definitions: 1. Purification; removal of waste products or foul excretions.
To free from impurities, purify. 
The process of removing pathogens from shellfish by keeping them in clean water for a period of time prior to sale.