Jastrow: תְּכֵלֶת

תְּכֵלֶת f. (b. h.) purple-shell, a bluish or cerulean dye, purple-blue wool, esp. the purple-blue thread used for the show-fringes. Sot. 46ᵇ היא לוז שצובעין בה ת׳ that is the city of Luz where they dye the t’kheleth (v. לוּז I). Men. IV, 1, v. עָכַב. Ib. 38ᵃ מצוה … לבן לת׳ it is proper to take the white thread first and then the blue. Ib. 38ᵇ איגרדם ת׳, v. גַּרְדֵּם. Num. R. s. 183 טלית שכולה ת׳ מהו וכ׳ if a cloak is made entirely of blue wool, is it exempt from show-fringes? Ib. טלית שכולה ת׳ אינה וכ׳ a cloak entirely of blue wool does not release (is insufficient for compliance with the law), and four threads are sufficient?; a. v. fr.