Jastrow: קִיּוּהָא

קִיּוּהָא m. (קְהֵי) [that which blunts or loosens the teeth,] acid, acrid taste. Pes. 74ᵇ sq. התם איתא לק׳ … ליתיה לק׳ וכ׳ there (in the case of stale vinegar) the acid of the fruit is present (in its natural condition), here (in vinegar which has once been used for drawing the blood from meat) the acid is no longer pure. Keth. 61ᵃ כל … ואית ליה ק׳ any food that has a penetrating savor or an acrid taste (is injurious to him in whose presence it is partaken of without his being permitted a taste of it). Ib. 75ᵃ ק׳ דחמרא (Ar. s. v. משק: מקוה) wine that has turned sour. Midr. Till. to Ps. LXXV, 9 יכול ק׳ lest you think, sour (stale) wine is meant; (Yalk. ib. 813 דוחה, v. דָּהָה).