One of the ingredients (Ex. xxx. 23) of the oil made specially for anointing the tabernacle (Ex. xxx. 26), its vessels (ib. 27-29), and the priests (ib. 30). The calamus reed was fragrant, and is therefore mentioned in the long list of spices and fragrant woods in Cant. iv. 14. It was one of the articles in which Tyre traded (Ezek. xxvii. 19). See Reed.