Comments: PAT *abV (cf. also Abkh. plur. ába-ča); PAK *at:a,*t:ǝ (cf. also Ad. /in compounds/ āt(a) ). Ub. def. form á-tʷ.
The correspondences are regular, thus it seems reasonable to accept Deeters's etymology (Deeters 1963,39), pace Shagirov (1, 56-57). Cf. also Mészáros 1934,208 (Abkh.-Ub.).