קַיִן, (b. h.) Cain, son of Adam. Snh. IV, 5 שכן מצינו בק׳ וכ׳ for so we find with reference to Cain when he had killed his brother &c. Ib. 37ᵇ מלמד שעשה ק׳ וכ׳ this use of the plural (דמי, Gen. IV, 10) shows that C. inflicted many wounds and bruises on his brother &c. Gen. R. s. 2 ובהו זה ק׳ וכ׳ ‘and void’ (Gen. I, 2), this refers to Cain who intended to reduce the world to waste and voidness; a. v. fr.