The Collaborative International Dictionary of English v.0.48:

Fulmar \Ful"mar\ (f[u^]lm[aum]r), n. [Icel. f[=u]lm[=a]r. See
   foul, and Man a gull.] (Zool.)
   One of several species of sea birds, of the family
   Procellariid[ae], allied to the albatrosses and petrels.
   Among the well-known species are the arctic fulmar
   (Fulmarus glacialis) (called also fulmar petrel,
   malduck, and mollemock), and the giant fulmar (Ossifraga
   gigantea).
   [1913 Webster]

WordNet (r) 3.0 (2006):

fulmar
    n 1: heavy short-tailed oceanic bird of polar regions [syn:
         fulmar, fulmar petrel, Fulmarus glacialis]