| Noun | 1. | podicipitiform seabird - aquatic birds related to the loons sea bird, seabird, seafowl - a bird that frequents coastal waters and the open ocean: gulls; pelicans; gannets; cormorants; albatrosses; petrels; etc. Colymbiformes, order Colymbiformes, order Podicipediformes, order Podicipitiformes, Podicipediformes, Podicipitiformes - grebes grebe - small compact-bodied almost completely aquatic bird that builds floating nests; similar to loons but smaller and with lobate rather than webbed feet |