CASTOREUMS is validvalid

CASTOREUM, a substance used by beavers for scent-marking territory [n]

123,268 of 196,601 in NWL2023·also valid in CSW24

CASTOREUM, (Latin) the dried perineal sacs of the beaver, or a brown unctuous strong-smelling substance obtained from them, formerly used in medicine and perfumery [n]