Medical Dictionary


noun bio·mark·er \ˈbī-ō-ˌmär-kər\

Medical Definition of BIOMARKER

:  a distinctive biological or biologically derived indicator (as a biochemical metabolite in the body) of a process, event, or condition (as aging, disease, or exposure to a toxic substance) <age-related biomarkers of disease and degenerative change—Janet Raloff>


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