Definitions for mainlineˈmeɪnˌlaɪn, -ˈlaɪn

This page provides all possible meanings and translations of the word mainline

Random House Webster's College Dictionary

main′ line′(n.)

  1. a principal highway or railway line.

    Category: Railroads

  2. Slang. an accessible vein that can be used to inject a narcotic.

    Category: Status (usage)

Origin of main line:


main•lineˈmeɪnˌlaɪn, -ˈlaɪn(v.; adj.)-lined, -lin•ing

  1. (v.i.) inject a narcotic directly into a vein.

    Category: Status (usage)

  2. (v.t.)Slang. to inject (a narcotic) directly into a vein.

    Category: Common Vocabulary, Status (usage)

  3. (adj.)having a principal, established, or widely accepted position.

    Category: Common Vocabulary

Origin of mainline:

1935–40, Amer.


Princeton's WordNet

  1. mainline(verb)

    inject into the vein

    "She is mainlining heroin"


  1. mainline(Verb)

    To inject (a drug) directly into a vein.

  2. mainline(Adjective)

    normal, principal or standard.

  3. mainline(Adjective)

    Of or pertaining to the principal route or line of a railway

  4. mainline(Adjective)

    Of or pertaining to a surface railway as distinct from an underground, elevated or light rail one.

  5. Origin: * main + line


  1. Mainline Protestant

    The Mainline Protestant churches are a group of Protestant churches in the United States that contrast in history and practice with evangelical, fundamentalist, and charismatic Protestant denominations, although some mainline churches include evangelicals and charismatics. Mainline Protestants were a majority of all Christians in the United States until the mid-20th century, but now constitute a minority among Protestants. Mainline churches include the United Methodist Church, the Evangelical Lutheran Church in America, the Presbyterian Church, the Episcopal Church, the American Baptist Churches, the United Church of Christ, the Disciples of Christ, Reformed Church in America, and Hicksite Quakers, among others. Mainline churches share a common approach to social issues that often leads to collaboration in organizations such as the National Council of Churches. Because of their involvement with the ecumenical movement, mainline churches are sometimes given the alternative label of ecumenical Protestantism. These churches played a leading role in the Social Gospel movement and were active in social causes such as civil rights and equality for women.


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