mainline

  1. Adjective.  normal, principal or standard.
  2. Adjective.  (rail transport) Of or pertaining to the principal route or line of a railway.
  3. Adjective.  (rail transport) Of or pertaining to a surface railway as distinct from an underground, elevated or light rail one.
  4. Verb.  To inject (a drug) directly into a vein.

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This entry was last updated on RefTopia from its source on 3/20/2012.