Source : Webster's Revised Unabridged Dictionary (1913)

Malmsey \Malm"sey\, n. [OE. malvesie, F. malvoisie, It.
   malvasia, malavagia, fr. Malvasia, or Napoli di Malvasia, in
   the Morea.]
   A kind of sweet wine from Crete, the Canary Islands, etc.
   --Shak.

Source : WordNet®

malmsey
     n : sweet Madeira wine