The Collaborative International Dictionary of English v.0.48:

Stewardess \Stew"ard*ess\, n.
   A female steward; specifically, a woman employed in passenger
   vessels to attend to the wants of female passengers.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stewardess
    n 1: a woman steward on an airplane [syn: stewardess, air
         hostess, hostess]