Mainline (disambiguation) | definition of Mainline (disambiguation) by Medical dictionary
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v. main·lined, main·lining, main·lines Informal
To inject (an illegal or addictive drug, such as heroin) directly into a major vein.
To inject a drug intravenously.
mainline A regional term most commonly used as a verb in the drug subculture, meaning to inject a drug, usually understood to be illicit (e.g., heroin).
mainline Drug slang verb To inject a drug