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tracknoun Substance abuse A punctate, erythematous linear scar on the skin of the extremities, neck, and groin, and on mucocutaneous surfaces, which may be accompanied by intense venous sclerosis and edema of the extremities, a typical finding in heroin addicts. Cf Skin 'popping. '.
1. The path or course of a penetrating injury.
2. A treatment regimen or protocol.