יָחַס (b. h. יָחַשׂ; v. חוּס 2) to connect, be connected.—Denom. יִחַס.
    Pi. - יִחֵס, יִי׳ (denom. of יַחַס) 1) to trace the connection (יַחַס) of events or descent. Meg. 17ᵃ כדי לְיַיחֵס בהן שנותיו וכ׳ (Rashi: להִתְיַיחֵס) in order to trace through them the years of Jacob (in which the principal events of his life occurred); Yeb. 64ᵃ; Yalk. Gen. 110. Ib.; Gen. R. s. 62 (ref. to Gen. XXV, 12 sq.) מה ראה הכתוב לייחס תולדותיו וכ׳ what reason was there for the Bible to insert here the genealogy of that &c.?—Snh. 82ᵇ בא הכתוב ויִחֲסוֹ the Scripture comes and records his genealogy (Num. XXV, 11). Sabb. 55ᵇ אפשר … והכתוב מְיַחֲסוֹ is it possible that he was a sinner and the Scripture would state his genealogy?; a. fr. —2) to nobilize, distinguish, invest with prerogatives. Num. R. s. 13 יִיחֲסוֹ הכתוב על שם שבטו the Scripture distinguished him (giving him the privilege of the first offering) for the sake of his tribe (Num. VII, 12). Gen. R. s. 82 אין מְיַיחֲסִין ליוסף וכ׳ not Joseph is ranked in the records as the first-born; a. e.—Part. pass. מְיוּחָס, f. מְיוּחֶסֶת. pl. מְיוּחָסִים, מְיוּחָסִין; מְיוּחָסוֹת of traceable genealogy, of legitimate descent; of distinguished birth, well-connected. Hor. 13ᵃ שזה מי׳ וזה אינו מי׳ for this one (the Israelite) is of legitimate birth, and the other (the bastard) is not. Kidd. 70ᵇ משפחות מי׳ וכ׳ families in Israel of traceable descent. Ib. 71ᵇ האי מי׳ טפי this one (who first ceased quarreling) is of nobler birth; a. fr.
    Hithpa. - הִתְיַיחֵס, , Nithpa. נִתְיַיחֵס 1) to claim a pedigree. Tosef. Peah IV, 11 היתה מִתְיַיחֶסֶת עם וכ׳ ed. Zuck. (Var. על) claimed to be connected with Arnon, the Jebusite; Y. ib. VIII, 21ᵃ bot. היתה מתי׳ של וכ׳ boasted to be descendants of &c. —2) to be enrolled in genealogical lists, be recorded. Num. R. l. c. זכו להִתְיַ׳ וכ׳ they were privileged to have their genealogy recorded by the side of Moses. Cant. R. to I, 1 נ׳ ראש לשלשלת יוחסין (not לשלשת) he was recorded as the starter of a chain of genealogy (I Kings XIV, 21). Gen. R. l. c. (expl. I Chr. V, I) לא לראובן להתייחס not to Ruben was genealogical priority to be given; a. fr.