Rail

1. noun

   any of numerous widely distributed small wading birds of the family Rallidae having short wings and very long toes for running on soft mud

2. noun

   a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll

   Similar: track, rails, runway

3. noun

   a barrier consisting of a horizontal bar and supports

   Similar: railing

4. noun

   a horizontal bar (usually of wood or metal)