'Sea bird' definitions:

Definition of 'sea bird'

From: WordNet
noun
A bird that frequents coastal waters and the open ocean: gulls; pelicans; gannets; cormorants; albatrosses; petrels; etc. [syn: seabird, sea bird, seafowl]

Definition of 'Sea bird'

From: GCIDE
  • Sea bird \Sea" bird`\ (Zool.) Any swimming bird frequenting the sea; a sea fowl. [1913 Webster]