Castor definition, Also, castoreum. a brownish, unctuous substance with a strong, penetrating odor, secreted by certain glands in the groin of the beaver, used in medicine and perfumery. See more.
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Jan 5, 2018 - Castor oil is a vegetable oil that is derived from the bean of the castor tree. The fatty acids that make up castor oil are believed to be extremely nourishing to the skin. Many people report that with regular application, castor oil has helped them to grow thicker, longer eyelashes and eyebrows. Does it really ...