Definition of mainliner
1 : a member of a mainline group (such as a church) Of the remaining mainliners, the Christian Church (Disciples of Christ) has suffered most. It has lost 40 percent of its members and now claims only 1,146,000 faithful. — Kenneth L. Woodward, Newsweek, 22 Dec. 1986
2 informal : a person who injects a drug into a vein : a person who mainlines a drug She holds nothing back about the awful things done to her, or about her attraction to the social danger zones inhabited by strippers, heroin mainliners, rhino poachers, and guerrillas. — Gilbert Taylor, Booklist, 1 Dec. 2000
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First Known Use of mainliner
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