Flavour

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late Middle English (in the sense ‘fragrance, aroma’): from Old French flaor, perhaps based on a blend of Latin flatus ‘blowing’ and foetor ‘stench’; the -v- appears to have been introduced in Middle English by association with savour. flavour (sense 1 of the noun) dates from the late 17th century.

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etymonline

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flavour

chiefly British English spelling of flavor; for spelling, see -or. Related: Flavoured; flavourful; flavouring.