What was the name of the oily musk made from the glands of dead beavers?

The oily musk made from the glands of dead beavers is called "castoreum." It is a substance secreted by the castor glands of beavers and has been historically used in perfumes, flavorings, and traditional medicine. Castoreum has a distinctive scent and was valued for its aromatic properties. However, its use has declined with the advent of synthetic alternatives.