An alternative or archaic spelling of 'bun,' a small bread roll, or a variant of 'bun' as a hairstyle.
This is an older English spelling variant of 'bun,' which itself came from Old French 'bugne.' The double-n spelling appears in Middle English texts but became less common over time.
Medieval scribes spelled the same word different ways depending on their mood—'bunn' with two n's shows how spelling wasn't standardized until dictionaries forced everyone to choose just one version.
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