Meaning of main line

main' line'

Pronunciation: [key]
  1. a principal line or route of a railroad, as contrasted with a branch or secondary one.
  2. a principal highway.
    1. a prominent and readily accessible vein of the body that may be used for a narcotic's injection.
    2. the act of mainlining.

Main' Line"

Pronunciation: [key]
  1. a fashionable residential district west of Philadelphia.
  2. any fashionable district where socially prominent people live.

main•line

Pronunciation: (mān'līn", -līn'), [key]
— v., adj. -lined, -lin•ing,
—v.i.
—v.t.
—adj.
  1. having a principal, established, or widely accepted position; major; mainstream: the membership of mainline churches.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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