From Longman Dictionary of Contemporary Englishbreastplatebreast‧plate /ˈbrestpleɪt/ noun [countable] PMa leather or metal protective covering worn over the chest by soldiers during battles in the past
Examples from the Corpus
breastplate• He's looking resplendent, you didn't know that he has a breastplate of medals, did you?• A breastplate of darkness hid all the windows except one.• Strap on your bodices, jerkins and breastplates.• Carlo was large as a steroid junkie yet not puffy-firmly outlined, with a chest like an armor breastplate.• His breastplate was the aegis, awful to behold; his bird was the eagle, his tree the oak.• He tugged off the leather breastplate, then the tunic, and brushed at the blood.• This is comparable to wearing a mail shirt or breastplate, conferring a D6 saving throw of 6.• With a silver breastplate stuck full of arrows and the roars of the bloodthirsty pagans turned to weeping and conversion. 