Webster's English Dictionary

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breastplate

breast.plate \'bres(t)-.pla-t\ n 1: a metal plate worn as defensive armor 
   for the breast  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 the workman presses his breast in operating a brea st drill 
   or similar tool 4: PLASTRON