יְרַח, (= h. יָרֵחַ a. יֶרַח) moon; month.—יומא די׳ or י׳ (sub. ריש) the first day of the month, New-Moon-Day. Targ. Is. XLVII, 13. Ib. LXVI, 23. Targ. I Sam. XX, 18. Targ. Ez. XLVI, 1; a. fr.—Targ. O. Deut. XXI, 13 יִרַח יומין ed. Berl. (oth. ed. יְרַח; Y. תלתא יַרְחִין).—Lev. R. s. 29; Pesik. R. s. 40 (ref. to בחדש השביעי, Lev. XXIII, 24) בי׳ דשבועתא in the month of oaths (Gen. XXII, 16). Sabb. 86ᵇ בחד בשבא איקבע י׳ the New-Moon was declared on the first day of the week. Ib. פליגי בקביע די׳ they differ as to the day on which the New Moon was declared. Bets. 4ᵇ והשתא דידעינן בקביעא די׳ and now that we know the time of the New Moon (by fixed calendar); a. fr.—Pl. יַרְחִין, יַרְחַיָּא, יַרְחֵי. Targ. Y. Gen. I, 14. Targ. Ex. II, 2; a. fr.—R. Hash. 20ᵃ בשאר י׳ as to the other months (than Nisan and Tishri). Y. ib. II, 57ᵈ bot. Macc. 23ᵇ; a. fr.—תריסר ירחי שתא twelve months (forming) a year, twelve months from date. B. Mets. 16ᵇ; 35ᵃ. Ab. Zar. 8ᵇ; a. e.