mainline

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mainline

(mān′līn′)
v. main·lined, main·lining, main·lines Informal
v.tr.
To inject (an illegal or addictive drug, such as heroin) directly into a major vein.
v.intr.
To inject a drug intravenously.

main′lin′er n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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).
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

mainline

Drug slang verb To inject a drug
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.