simple past tense and past participle of shield
"The thick concrete walls had effectively shielded us from the deafening roar of the explosion."
(used especially of machinery) protected by a shield to prevent injury
"The mechanic carefully adjusted the gears while his hands remained safely behind the metal guard that shields moving parts from injury."
provided with a shield
"The new building's design includes thick glass walls that are completely shielded from direct sunlight by external louvers."