The Collaborative International Dictionary of English v.0.48:

Parka \Par"ka\, Parkee \Par"kee\, n. [Russ. parka, parki, dim.
   of para a pair, fr. G. paar, L. par. Cf. Pair.]
   1. An outer garment made of the skins of birds or mammals,
      worn by Eskimos, etc.
      [Webster 1913 Suppl.]

   2. A coat with a fur lining and a hood, used for protection
      in very cold weather.
      [PJC.]

   3. Hence: Any of a variety of jackets with attached hoods,
      usually of very warm or waterproof construction so as to
      provide protection from cold or rainy weather.
      [PJC.]

WordNet (r) 3.0 (2006):

parka
    n 1: a kind of heavy jacket (`windcheater' is a British term)
         [syn: parka, windbreaker, windcheater, anorak]