[1] : The Collaborative International Dictionary of English v.0.48

pajamas \paja"mas\, n. pl. hind. p=a-j=ama, p=aej=ama,
   lit., leg closing.
   originally, in india, loose drawers or trousers, such as
   those worn, tied about the waist, by mohammedan men and
   women; by extension, a similar garment adopted among
   europeans, americans, etc., for wear in the dressing room and
   during sleep; also, a suit consisting of drawers and a loose
   upper garment for such wear. also spelled pyjamas.
   webster 1913 suppl.
see also:
pyjamas 

[2] : The Collaborative International Dictionary of English v.0.48

pyjamas \pyja"mas\, or, chiefly u. s., pajamas \paja"mas\, n.
   pl.
   a garment, similar to the oriental pyjama which see,
   adopted among europeans, americans, and other occidentals,
   for wear in the dressing room and during sleep; also, a suit
   of drawers and blouse for such wear.
   webster 1913 suppl.
see also:
pyjama 

[3] : WordNet (r) 2.0

pajamas
     n 1: loose-fitting nightclothes worn for sleeping or lounging;
          have a jacket top and trousers syn: pyjamas, pj's,
          jammies
     2: lightweight trousers worn in various eastern countries syn:
         pyjamas
see also:
pyjamas pj's jammies 

Pajamas >> P Words
Pajamas, definition of term: Pajamas
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