Plural of breastplate; protective metal plates or armor pieces that cover the chest and torso in suits of armor.
Compound: 'breast' (chest) + 'plate' (a flat metal sheet) + '-s' (plural). Standard terminology in armor and military history since medieval times.
A single steel breastplate weighed 20-30 pounds and could stop a sword thrust—but medieval soldiers wore them for hours in battle, their bodies engineered by training to distribute that weight. It's why knights were considered elite warriors: they had the strength and skill to fight effectively while armored.
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