Dictionary:

biomarker

  (bī'ō-mär'kər)

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1. See marker (sense 9).
2. A specific physical trait used to measure or indicate the effects or progress of a disease or condition: Biomarkers of aging include thinning of the hair and diminished elasticity of the skin.

A short-lived radioactive molecule that can be used as a marker to follow a condition or a process.

1. See marker (sense ).
2. A specific physical trait used to measure or indicate the effects or progress of a disease, illness, or condition.

A biological unit used as an indirect indicator of the impact of pollutants on biota, e.g. an enzyme such as mixed function oxygenase levels, immune status of animals in the receiving environment.