Breastplate

1. n. 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. n. A plate of metal covering the breast as defensive armor.
3. n. A piece against which the workman presses his breast in operating a breast drill, or other similar tool.
4. n. A strap that runs across a horse’s breast.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.