I Subst. io, n. (cf. aitherrach, aitherracht?) patronymic: ar is in oensillaib forbeir a n-a.¤ sech a cognomen, Sg. 32a1 (see Thes. ii 84 note g). ainmm ninchoisc cenéuil issed file la laitnóri tar hési naitherrechtaichthe la grecu, 30b8 . issi fil isind aitherrechtaigthu, 5 .

II Adj. io, iā: i n-engraicc anmmae aitherrechtaigthi gl. loco patronomicorum, Sg. 30b16 .