from
The Collaborative International Dictionary of English v.0.48
Pajamas \Pa*ja"mas\, n. pl. [Hind. p[=a]-j[=a]ma, p[=a]ej[=a]ma,
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.]
from
The Collaborative International Dictionary of English v.0.48
Pyjamas \Py*ja"mas\, or, chiefly U. S., Pajamas \Pa*ja"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.]