Definitions
1.nounSomeone (especially one who is male) who is skilled in the work of fighting fire.
2.nounA person (originally a man) who keeps the fire going underneath a steam boiler (originally, shoveling coal by hand), particularly on a railroad locomotive or steamship.
3.nounBy extension of the above, an assistant on any locomotive, whether steam-powered or not.
4.nounA relief pitcher.
5.nounA safety inspector in coal mines.