רְבִיעִי, (b. h.) fourth. Taan. 29ᵇ חל להיות … בר׳ (sub. בשבת) if the ninth of Ab falls … on a Wednesday; Meg. 22ᵇ. Keth. I, 1 בתילה נשאת ליום הר׳ it is customary for a virgin to be married on the fourth day of the week; a. v. fr.—Esp. fourth grade of uncleanness. Ḥag. III, 2; Tosef. ib. III, 7 הר׳ פסול וכ׳ the fourth grade is a disqualification in sacrificial food, the third, in T’rumah. Ib. 18; a. fr.—Fem. רְבִיעִית. Meg. III, 4 (29ᵃ) בר׳ on the fourth Sabbath of Adar; a. fr.—Esp. (sub. לוֹג) one fourth of a Log. B. Bath. 58ᵇ איזהו אנטל זהו ר׳ what is Anṭal? The fourth of a Log mentioned in connection with religious ceremonies (v. comment.). Y. Sabb. VIII, 11ᵃ bot. ר׳ של תורה וכ׳ Ar. (ed. שיעורו של כוס) the legal r’biʿith (for the cup of the Passover night) is a bottom of two fingers by two, with a height of one and five-sixths of a finger. Sot. 5ᵃ אדם שאין בו אלא ר׳ אחת וכ׳ man in whom there is only one-fourth of a Log (of vital blood, v. Rashi) &c.; Sabb. 31ᵇ bot.; a. v. fr.—Pl. רְבִיעִיּוֹת. Sot. l. c. Lam. R. to IV, 1 (ref. to אבני קדש, ib.) אלו שתי ר׳ של דם וכ׳ this refers to the two-fourths of blood (of king Josiah) which Jeremiah took up (from the battlefield) and buried (v. II Chr. XXXV, 24 sq.). Pes. 112ᵃ לילי ר׳ the nights of the fourth days of the week, Tuesday evenings; a. fr.