Webster's English Dictionary

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steam

1. steam \'ste-m\ n [ME stem, fr. OE ste-am; akin to D stoom steam] often 
   attrib  1: a vapor arising from some heated substance  2a: the invisible 
   vapor into which water is converted when heated to the bo iling point 2b: 
   the mist formed by the condensation on cooling of water vapor  3a: water 
   vapor kept under pressure so as to supply energy for heating, coo king, or 
   mechanical work; also : the power so generated 3b: driving force : POWER  
   3c: emotional tension  4a: STEAMER  4b: travel by or a trip in a steamer 
2. steam vi 1: to rise or pass off as vapor  2: to give off steam or vapor  
   3: to move or travel by or as if by the agency of steam  4: to be angry : 
   BOIL  1: to give out as fumes : EXHALE  2: to expose to the action of steam 
   (as for softening or cooking)