to avert by sacrifice the misfortune portended by lightning

pĭo, āvi, ātum, 1, v. a. [pius].

To seek to appease, to appease, propitiate by sacrifice (syn. place).—

Lit.:

Silvanum lacte piabant,

Hor. Ep. 2, 1, 143:

ossa,

Verg. A. 6, 379:

busta (i.e. Manes),

Ov. M. 13, 515:

Janus Agonali luce piandus erit,

id. F. 1, 318.—

Transf.

To honor with religious rites, to celebrate:

ubi piem Pietatem,

Plaut. As. 3, 1, 3:

aras ture,

Prop. 3, 10 (4, 9), 19:

in magicis astra piare focis,

to perform sacred rites, id. 1, 1, 20.—

To purify with sacred rites (syn.:

procuro, lustro): si quid tibi piandum fuisset,

Cic. Dom. 51.—

To make or seek to make good, to atone for, expiate:

damna,

Ov. A. A. 3, 160:

mors morte pianda est,

id. M. 8, 483:

fulmen,

to avert by sacrifice the misfortune portended by lightning, id. F. 3, 291:

nefas triste,

to atone for, avert the penalty, Verg. A. 2, 184; Ov. H. 19, 194:

cometes terrificum sidus, ac non leviter piatum,

Plin. 2, 25, 23, § 92.—

To punish, avenge:

culpam morte,

Verg. A. 2, 140:

grande nefas et morte piandum,

Juv. 13, 54.—

To free from madness, Fest. p. 213 Müll.:

jube te piari de meā pecuniā: nam ego quidem insanum te esse certo scio,

Plaut. Men. 2, 2, 17; so id. ib. 3, 2, 51.