מוּסָף m. (יָסַף) [addition,] 1) attachment, rim (cmp. אִסְטַגְיוֹת). Kel. V, 5 מוּסַף התנור a chimney-piece; מ׳ היורה the rim around a boiler in the ground. Ib. 11 מ׳ של טיט a moulding of clay around the stove; Tosef. Kel. B. Kam. IV, 18. Tosef. Par. XII (XI), 10 מ׳ יורה, v. supra. Ib. המוסיף (corr. acc.); a. fr. —2) (sub. תְּפִלַּת, קָרְבַּן) Musaf, additional offering, additional prayer on Sabbaths and festive (and fast-) days. Tosef. Ber. III, 10 כל שאין בו מ׳ a half-festival on which there is no Musaf (prayer or offering); וכל שיש בו מ׳ and one on which there is a Musaf; Sabb. 24ᵃ ימים שיש בהן קרבן מ׳. Ib. כיון דלית ביה מ׳ since there is no Musaf appointed for it; a. fr.—Pl. (with sing. sense) מוּסָפִין. Ib. Ber. IV, 1. Ib. 28ᵃ; a. fr.