סֵירוּס, סֵר׳ m. (סָרַס) 1) castration, mutilation. Kidd. 25ᵃ אף הס׳ castration of a slave also entitles him to his liberty. Sabb. 110ᵇ; a. fr. —2) breaking the line, irregularity. B. Bath. 80ᵃ (expl. ומסרס, Mish. ib. V, 3), נוטל ג׳ נחילין בס׳ he takes three broods of bees not in immediate succession of their birth, i.e. the first, the third and the fifth brood.—Pl. סֵירוּסִים, סֵירוּסִין, סֵר׳ (adv.) out of order, irregularly. Meg. 18ᵃ, sq.; Y. ib. II, beg. 73ᵃ קראה … ס׳ if one read the M’gillah in deranged order (= לְמִפְרֵעַ); cmp. סֵירוּג.