The Collaborative International Dictionary of English v.0.48:

Portuguese \Por"tu*guese\, a. [Cf. F. portugais, Sp. portugues,
   Pg. portuguez.]
   Of or pertaining to Portugal, or its inhabitants. -- n. sing.
   & pl. A native or inhabitant of Portugal; people of Portugal.
   [1913 Webster]

   Portuguese man-of-war. (Zool.) See Physalia.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Portuguese
    adj 1: of or relating to or characteristic of Portugal or the
           people of Portugal or their language; "Portuguese wines"
           [syn: Portuguese, Lusitanian]
    n 1: the Romance language spoken in Portugal and Brazil
    2: a native or inhabitant of Portugal

The Devil's Dictionary (1881-1906):

PORTUGUESE, n.pl.  A species of geese indigenous to Portugal.  They
are mostly without feathers and imperfectly edible, even when stuffed
with garlic.