mainline
- Adjective. normal, principal or standard.
- Adjective. (rail transport) Of or pertaining to the principal route or line of a railway.
- Adjective. (rail transport) Of or pertaining to a surface railway as distinct from an underground, elevated or light rail one.
- 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.