A bird's beak or bill, or a person's nose or mouth used informally.
From Old English 'nebba' meaning beak or nose. The word has Germanic roots and originally referred to any pointed projecting part, with the meaning eventually specializing to beaks and faces.
The word 'neb' survives mostly in Scottish and Northern English dialects, but it's the same root that gives us 'nebula'—both originally meant something pointed or protruding, showing how the same root can evolve into completely different modern words.
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