breastplate
noun
breast·plate
ˈbres(t)-ˌplāt
1
: a usually metal plate worn as defensive armor for the breast see armor illustration
2
: a vestment worn in ancient times by a Jewish high priest and set with 12 gems bearing the names of the tribes of Israel
3
: a piece against which a worker's breast is pressed in operating a tool (such as a breast drill)
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Merriam-Webster unabridged
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