a common auk, Alca torda, of the North Atlantic, having a thick laterally compressed bill with white markings
razorbill in American English
(ˈreɪzərˌbɪl)
noun
an auk (Alca torda) of the N Atlantic coasts, with sooty black head and neck, white breast and belly, and a black, compressed bill encircled by a white band: its wings are black as seen from above and white as seen from below