כִּלְאַיִם, du. (b. h.; כלא, v. Ges. H. Dict. s. v.) junction of two, esp. Kilayim, the forbidden junction of heterogeneous plants in the same field, of heterogeneous animals by hybridization or by harnessing together, of wool and linen in the same web (Lev. XIX, 19; Deut. XXII, 9 to 11). Gen. R. s. 82; Y. Ber. VIII, 12ᵇ top האש והכ׳ וכ׳ fire and hybrids (mules) although not having been created in the six days &c. Kil. VIII, 1 כְּלָאֵי הכרם mixed seeds in the vineyard. Ib. I, 1 אינם כ׳ זה בזה are no forbidden junction. Ib. 9 משום כ׳ as coming under the law of K.—Tosef. ib. III, 16 כשית אינו כ׳ cuscuta is not forbidden (in the vineyard); Sabb. 139ᵃ; a. v. fr.—Kilayim, name of a treatise of the Mishnah and Tosefta, of the Order of Z’raïm.