WordNet (r) 3.0 (2006):

ironman
    n 1: a strong man of exceptional physical endurance [syn: iron
         man, ironman]

The Free On-line Dictionary of Computing (30 December 2018):

Ironman

   HOLWG, DoD, Jan 1977, revised Jul 1977.  Fourth of the series
   of DoD requirements that led to Ada.  "Department of Defense
   Requirements for High Order Computer Programming Languages",
   SIGPLAN Notices 12(12):39-54 (Dec 1977).  "Revised Ironman
   Requirements for High Order Computer Programming Languages",
   US Dept of Defense, Jul 1977.  (See Strawman, Woodenman,
   Tinman, Steelman).