pelecaniform seabird pe·le·ca·niformseabird uncommon noun 1. large fish-eating seabird with four-toed webbed feet Synonymspelecaniform seabird Related words Broader terms seabird Narrower terms pelicanfrigate birdgannetcormorantsnakebirdtropic bird WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.