WordReference Random House Unabridged Dictionary of American English © 2026
cas•tor•e•um
(ka stôr′ē əm, -stōr′-),USA pronunciation n.
- castor1 (def. 1).
- Greek kastórion, equivalent. to kastor- (stem of kástōr) beaver + -ion, neuter of -ios adjective, adjectival suffix
- Latin
'castoreum' also found in these entries (note: many are not synonyms or translations):