piō āvī, ātus, āre
pius, to approach with sacred rites, appease, propitiate : Silvanum lacte, H.: ossa, V.: Ianus piandus erit, O.— To purify with sacred rites : si quid tibi piandum fuisset.— To make good, atone for, expiate : mors morte pianda est, O.: fulmen, avert the omen of lightning , O.: prodigia, Ta.: culpam morte, atone for , V.: nefas morte piandum, i. e. to be punished , Iu.