רִתְחָא, רִי׳ m. (preced.) 1) heat; anger, excitement. Targ. Ps. XIX, 7. Ib. XXXVII, 8. Ib. LXXVIII, 38 Ms. (ed. חמת׳); a. fr.—Ber. 7ᵃ ומי איכא ר׳ וכ׳ is there anger before the Lord, i.e. is the Lord ever angry? Snh. 105ᵃ (ref. to Ez. XX, 33) כל כי האי ר׳ לירתח וכ׳ let the Merciful have all that anger, if he only redeem us; R. Hash. 32ᵇ; a. e.—Pl. רִתְחַיָּא, רִי׳. Targ. Ps. LXXVI, 11 (ed. Wil. sing.; h. text חמות). —2) (cmp. קֶצֶף) pestilence. B. Kam. 60ᵇ בעידן ר׳ הוי וכ׳ closed the windows at the time of an epidemic. —3) foam, v. רוּתְחָא.