noun

1. Rare a beaver
2. a sexual gland of the beaver containing a strong-smelling, oily substance used as a scent in trapping and in making perfumes
   also castoreum cas·to′·reum (kas tôr′ē əm)
3. a hat of beaver or rabbit fur

Etymology: Fr < L < Gr kastōr, beaver, after Castor: with ref. to Castor as protector of women from disease; substance was used for treating women's diseases

noun

noun

1. Gr. & Rom. Myth. the mortal twin of Pollux
2. a multiple star, actually the second brightest star in the constellation Gemini although it is considered the twin of Pollux: magnitude, 1.6

Etymology: L < Gr Kastōr