קַו, circle, zone. Ḥag. 12ᵃ תהו קו ירוק וכ׳ tohu (Gen. I, 2) is the green (or yellow) circle which surrounds the whole world (the horizon); Yalk. Kings 185 (ref. to I Kings VII, 23) זה קו ירוק וכ׳ this is typical of the green circle &c. Num. R. s. 13 קו הים שעשה וכ׳ the circle encompassing the basin which Solomon made (I Kings l. c.); a. e.— [cavity,] the lower part of a trumpet. Kel. XI, 7, v. קב.—[Tanḥ. Aḥăré 1 קו שררתיה, v. קוֹשַׁרְתָּא.]