צֵירוּף m. (צָרַף) 1) smelting, reduction through trials. Keth. 112ᵇ צ׳ אחר צ׳ one reduction after the other (ref. to Is. VI, 13). —2) fusion, the state of being considered as one coherent mass or as one act. Pes. 19ᵃ צ׳ דאורייתא that things contained in one vessel are to be considered as one mass is a Biblical rule. Naz. 4ᵃ ר"ש לית ליה צ׳ R. S. does not adopt the rule of fusion (that the various things forbidden to the Nazarite, if partaken of together, combine to make up the legal quantity). Y. Maasr. IV, 51ᵇ למה לי צ׳ why is it necessary to apply the rule of fusion?; ואם צ׳ וכ׳ and if you apply the rule of fusion &c.; a. fr.—Pl. צֵירוּפִין. Y. Naz. II, 54ᶜ bot. [read:] ולמה נכללו לצ׳ (ed. Krot. לצירוכין, corr. acc.) and why have they again been stated by implication? To intimate that the rule of fusion applies to them (if eaten together). Ib.ᵈ bot. בצֵירוּפֵי נזיר as to the rule of fusion applied to the Nazarite; a. e.