roseau

Derivative of ros (“reed”), from Middle French ros (“reed”), from Old French ros (“reed, tooth of a weaver's comb”) (compare Old French rosel (“reed”)), from Frankish *rausa (“reed”), from Proto-Germanic *rausą, *rauzą (“pipe, reed, shaft, tube”), from Proto-Indo-European *er- (“to move, excite, grow”). Cognate with Old High German rōr (“pipe”) (German Rohr (“tube”)), Old Norse reyrr (“reed”) (Danish rør (“reed, pipe, tube”)), Old English rysc (“reed, rush”). More at rush.

• IPA^(key): /ʁo.zo/

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roseau m (plural roseaux)

1. common reed (Phragmites australis)
2. (by extension) any reed
3. quill, feather pen

• roselière

• “roseau” in le Trésor de la langue française informatisé (The Digitized Treasury of the French Language).