Castoreum is a alternative form of castorium.
As nouns the difference between castorium and castoreum
is that castorium is an alternative spelling of castoreum while castoreum is the bitter exudate of the castor sacs of mature beavers.
castoreum
Alternative forms
* castorium
Noun
(-)
The bitter exudate of the castor sacs of mature beavers.