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Definition of breastplate:

  1. A part of the vestment of the high priest, worn upon the front of the ephod. It was a double piece of richly embroidered stuff, a span square, set with twelve precious stones, on which were engraved the names of the twelve tribes of Israel. See Ephod.
  2. A piece against which the workman presses his breast in operating a breast drill, or other similar tool.
  3. A plate of metal covering the breast as defensive armor.
  4. A strap that runs across a horse's breast.


protection, auspices, egis, aegis.

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