Uncertain. Perhaps from Middle English *flos (attested in Middle English Flosmonger), related to English fleece. Alternatively from French floche ("tuft of wool"), from floc, from Old French flosche, from Latin floccus, probably from Frankish *flokkō, from Proto-Germanic *flukkô, from Proto-Indo-European *plewk-. Cognate with Old High German flocko ("down"), Middle Dutch vlocke ("flock"), Norwegian dialectal flugsa, Dutch flos ("plush") (tr=17c.).
From dialectal flosh, from Middle English flosche, flusche, flasche, flaske, perhaps from Old French flache, from Middle Dutch vlacke. Compare also German Floss ("a float").
Origin obscure. Perhaps of North Germanic origin. Compare Norwegian flos, flus.
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