Bioaccumulation Definition
 bīō-ə-kyo͝omyə-lāshən 
    noun
  
 The process in which industrial waste, toxic chemicals, etc. gradually accumulate in living tissue.
 Webster's New World 
The accumulation of a substance, such as a toxic chemical, in various tissues of a living organism.
 The bioaccumulation of mercury in fish.
 American Heritage Medicine 
(biology) The process by which substances accumulate in the tissues of living organisms; used especially of toxic substances that accumulate via a food chain.
Wiktionary 
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