mearachd

error, Irish mearaighim, I err, mearughadh, a mistaking, erring, Middle Irish merugud, wandering, root mer, mr$$.; Greek $$Ga$$`martanw, miss (see brath); English mar, Gothic marzian, cause to stumble. Cf. Early Irish mer, mad, meracht, mad act, Old Irish meraige, a fool, Old Breton mergidhaam, I am silly, which Loth joins to Greek $$Gmárgos, mad.