|1.||a. something used for distinguishing or marking|
|b. (as modifier): a marker buoy|
|2.||a person or thing that marks|
|3.||a person or object that keeps or shows scores in a game|
|4.||biological marker genetic marker See medical marker a trait, condition, gene, or substance that indicates the presence of, or a probable increased predisposition to, a medical or psychological disorder|
marker mark·er (mär'kər)
One that marks or serves as a mark.
A physiological substance, such as human chorionic gonadotropin or alpha-fetoprotein, that may indicate disease when present in abnormal amounts in the serum, as that caused by a malignancy. Also called biomarker.
A genetic marker.