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Definition of sweet flag
: a perennial marsh herb (Acorus calamus) of the arum family with long narrow sword-shaped leaves and an aromatic rootstock
— called also calamus
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sweet flag
noun\ -ˈflag 
\
\Medical Definition of sweet flag
: a perennial marsh herb (Acorus calamus) of the arum family (Araceae) having long leaves and a pungent rootstock and used especially formerly as a flavoring agent and in folk medicine but now largely abandoned because of demonstrated carcinogenicity and toxicity in laboratory animals — see calamus
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Time Traveler for sweet flag
The first known use of sweet flag was in 1765
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