Calamus (n.): The indian cane, a plant of the Palm family. It furnishes the common rattan. See Rattan, and Dragon's blood.
Calamus (n.): A species of Acorus (A. calamus), commonly called calamus, or sweet flag. The root has a pungent, aromatic taste, and is used in medicine as a stomachic; the leaves have an aromatic odor, and were formerly used instead of rushes to strew on floors.
Calamus (n.): The horny basal portion of a feather; the barrel or quill.
Calamus (n): The hollow spine of a feather
Calamus (n): A genus of Sparidae
Calamus (n): Perennial marsh plant having swordlike leaves and aromatic roots
Calamus (n): The aromatic root of the sweet flag used medicinally
Calamus (n): Any tropical Asian palm of the genus Calamus; light tough stems