or καστόριος, α, ον, of the beaver, ὄρχεις Hsch. s.v. κάστωρ· αἷμα Dsc. 2.24; — esp. καστόρειον or καστόριον, τό, castor, secretion found in the body of the beaver, used in medicine, Anon. Lond. 37.51, POxy. 1088.27 (i AD), Plu. 2.55a, Sor. 2.29, Phlp. in GC 65.29, etc.

vom Biber. S. auch nom. pr. unter Κάστωρ.