חִימּוּץ, (חָמֵץ I) becoming sour, fermentation, leavening. Pes. 39ᵇ שאינן באין לידי ח׳ which will not ferment (so as to become חָמֵץ). Ib., sq. (in Chald. diction) ואתי לידי ח׳ and may ferment. Bets. 7ᵇ שחִמּוּצוֹ קשה which is a strong leavening agent. Y. Ḥall. I, beg. 57ᵃ אין חִימּוּצוֹ חמץ ברור the fermentation which it produces is not real leavening. Nidd. 63ᵃ כמה חִמּוּצָן how long must urin stand to be considered as fermenting?—Pl. חִימּוּצִין salads, v. חוּמְצָן.