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1. A perennial herb (Acorus calamus) native to Eurasia and naturalized in North America, growing in marshy places and having grasslike leaves, minute greenish flowers borne on a thick spadix, and aromatic rhizomes used in medicine and perfumery. Also called calamus.
2. A similar plant (Acorus americanus) native to North America.
(Plants) an aroid marsh plant, Acorus calamus, having swordlike leaves, small greenish flowers, and aromatic roots. Also called: calamus
[C18: see flag2]
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|Noun||1.||sweet flag - perennial marsh plant having swordlike leaves and aromatic roots|
calamus - the aromatic root of the sweet flag used medicinally
calamus oil - carcinogenic oil from calamus root used as a perfume