Breastplate (noun)

1. A piece of armor that covers the chest and protects the wearer's vital organs.
2. A protective covering or shield for the chest of an animal, especially a horse.

Origin:

From old english bræstplega, from bræst (breast) + plega (play, covering). originally referred to a covering for the breast, later specifically referring to armor.

Examples:

1. The knight's breastplate was made of metal and designed to withstand the impact of a sword or arrow.
2. The soldier wore a modern version of a breastplate, made of lightweight composite materials for maximum protection.
3. The horse's breastplate prevented the girth from slipping and offered extra protection during rough riding.
4. Breastplates were an essential part of a medieval knight's armor, and were often decorated with intricate designs.
5. The jousting competition required knights to wear full plate armor, including a breastplate, for maximum safety.