bioconcentration
/ˌbʌɪə(ʊ)ˌkɒns(ɛ)nˈtreɪʃn/noun
Increase in the concentration of a (typically toxic) chemical in the tissue of organisms, especially progressive concentration in organisms further up the food chain; an instance of this.
Origin
1960s; earliest use found in Practical in Treatment Low- & Intermediate-level Radioactive Wastes. From bio- + concentration.