calamus
Concise Oxford English Dictionary © 2008 Oxford University Press:
calamus /ˈkaləməs/
▶noun (pl. calami /-mʌɪ/)
- 1 another term for sweet flag.
■ (also calamus root) a preparation of the aromatic root of the sweet flag.
- 2 Zoology the hollow lower part of the shaft of a feather.
– origin ME (denoting a reed or an aromatic plant mentioned in the Bible): from L., from Gk kalamos.
'calamus' also found in these Oxford entries:

