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English word calamus comes from Ancient Greek κάλαμος
κάλαμος (Ancient Greek)
calamus (Latin)
(by extension) an object made from a reed, such as a pen, arrow, or fishing rod. (of plants) a stalk, straw, blade. A reed, cane. The hollow arm of a candelabrum.
calamus (English)
A quill.. The sweet flag, Acorus calamus.