cal·a·mus 
(kălə-məs)
(kălə-məs)n. pl. cal·a·mi (-mī′)
1.
a. See sweet flag.
b. The aromatic rhizome of the sweet flag, used for medicinal purposes and yielding an oil used in perfumery.
2. Any of various chiefly tropical Asian climbing palms of the genus Calamus, having strong flexible stems used as a source of rattan.
3. See quill.
[Latin, reed, from Greek kalamos.]