(plural ironmen or ironmans)
- An extremely tough and strong athlete, especially one who competes in extreme athletic competitions or in a large number of games consecutively.
- (Australia) A form of surf lifesaving competition which combines swimming, board paddling, ski paddling and running.
- (Australia, by extension) The winner of such an event.
- An extreme form of triathlon, expecially one organised by the World Triathlon Corporation that comprises a 2.4 mile swim, a 112 mile bike race and a marathon run.
The plural ironmen pertains to the athlete; ironmans pertains to the event.