The Collaborative International Dictionary of English v.0.48:

Irishman \I"rish*man\, n.; pl. Irishmen.
   A man born in Ireland or of the Irish race; an Hibernian.
   [1913 Webster]

   Irishman's hurricane (Naut.), a dead calm.

   Irishman's reef. (Naut.) See Irish reef, under Irish,
      a.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Irishman
    n 1: a man who is a native or inhabitant of Ireland