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Definition of: guardrail
Our photo definition of guardrail 
(gärd′rāl′) noun
1. Naut. A timber bolted to a ship's side to serve as a fender.
2. On railroads, a beam or rail parallel to a main rail in a track to prevent the wheels from jumping the track: used on curves and other dangerous places.
3. A protective railing around any dangerous place.
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