rithisd

rithisd, rithis

rìs, a rithisd, etc., again, Irish arís, Old Irish arithissi, afrithissi, rursus. Ascoli suggests *frith-éisse, from éis, vestigium (see déis). Others have derived it from *ar-fithis, Old Irish fithíssi, absidas, fithis, a circle, orbit. The a at the beginning is for ar-: *ar-frithissi, that is, air, by, on, q.v. The root may well be sta, stand, reduplicated to *sistio-: thus *frith(sh)issi-, "resistere, backness".