seafowl n a bird that frequents coastal waters and the open ocean: gulls; pelicans; gannets; cormorants; albatrosses; petrels; etc. Usage(s) Walrus, seals, narwhal and varied seafowl have fallen to the voyagers' trusty guns, a high moment coming last fortnight when the Putnams, father and son, and Dan Streeter . Synonym(s) seabird sea bird