one of the longitudinal beams running along either side of a railway vehicle, onto which the bodywork is mounted, in passenger-carrying vehicles usually forming the side or the base of the floor. | long thick piece of wood or metal or concrete, etc., used in construction |
| a gymnastic apparatus used by women gymnasts |
| the broad side of a ship |
| (nautical) breadth amidships |
| a signal transmitted along a narrow path; guides airplane pilots in darkness or bad weather |
| a column of light (as from a beacon) |
| a group of nearly parallel lines of electromagnetic radiation |