Razorbill meaning

rāzər-bĭl
A large auk (Alca torda) of the northern Atlantic, having black-and-white plumage, a long tail, and a flattened bill.
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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.
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A large black and white auk, Alca torda, native to the north Atlantic.
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Origin of razorbill