rail·bird 
(rālbûrd′)
(rālbûrd′)n.
Slang
Slang
A horseracing enthusiast, especially one who watches races at the outer rail of the track.
- subchaser
- subclass
- subclavian
- subclavian artery
- subclavian vein
- subclimactic
- subclimax
- subclinical
- subclinically
- subcommittee
- subcompact
- subcomponent
- subconference
- subconscious
- subconsciously
- subconsciousness
- subcontinent
- subcontinental
- subcontract
- subcontractor
- subcontrary
- subcortex
- subcortical
- subcortically
- subcritical