Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A physiological substance, such as human chorionic gonadotropin or alpha-fetoprotein, that when present in abnormal amounts in the serum may indicate the presence of disease, as that caused by a malignancy.
  • noun A specific physical trait used to measure or indicate the effects or progress of a disease or condition.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun medicine A substance used as an indicator of a biological state, most commonly disease.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

bio- +‎ marker

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