Definition of "castoreum" [cas•to•re•um]

• The bitter exudate from the castor sacs of mature beavers (noun)

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• "The scent is leathery and animalic think both indolic and uric at once, and with that dry leathery undertone – hence it is most commonly described as a cross between civet and castoreum, which is a pretty good description if you ask me."
• "It was not, however, till of late years that the sagacious Indians discovered that the castoreum was a certain bait for the animals themselves."
• "They are seen near these dams and at their "lodges" on the banks of the stream, where they ooze out this castoreum, which is understood to be a signal to other beavers."