1. pieces of armor worn to protect the chest and front of the torso
Usage: historical; military
2. ornamental or ceremonial chest pieces worn as part of religious or official dress
Usage: religious; ceremonial

Examples

• The medieval knights wore steel breastplates into battle.
• Ancient Roman soldiers’ breastplates were made of bronze or iron.
• The museum displayed ornate breastplates from the Renaissance period.
• The high priest’s breastplates were decorated with precious stones.
• Modern riot police sometimes wear lightweight breastplates for protection.
• The ceremonial breastplates gleamed in the sunlight during the parade.