castor definition by Webster's New World
- Rare a beaver
- a sexual gland of the beaver containing a strong-smelling, oily substance used as a scent in trapping and in making perfumesalso castoreum
- a hat of beaver or rabbit fur
Origin: French ; from Classical Latin ; from Classical Greek kastōr, beaver, after Castor: with reference, refer to Castor as protector of women from disease; substance was used for treating women's diseases
- Gr. & Rom. Myth. the mortal twin of Pollux
- a multiple star, actually the second brightest star in the constellation Gemini although it is considered the twin of Pollux: magnitude, 1.6
Origin: Classical Latin ; from Classical Greek Kastōr
castor definition by American Heritage Dictionary
- An oily, brown, odorous substance obtained from glands in the groin of the beaver and used as a perfume fixative.
- A hat made of beaver fur or an imitation.
- A heavy wool fabric used especially for overcoats.
Origin: Middle English, from Latin, beaver, from Greek kastōr.
- Greek Mythology One of the Dioscuri.
- A double star in the constellation Gemini, the brightest star in the group, approximately 46 light-years from Earth.
Origin: Latin, from Greek Kastōr, twin of Pollux.
castor - Science Definition