Ironman definitions

ī'ərn-măn'
A male athlete of remarkable endurance or durability.
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A man having great physical strength and endurance.
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An extremely tough and strong athlete, especially one who competes in extreme athletic competitions or in a large number of games consecutively.
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(Australia) A form of surf lifesaving competition which combines swimming, board paddling, ski paddling and running.
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(Australia, by extension) The winner of such an event.
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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.
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Origin of ironman

From iron +‎ man.