breast·plate /ˈbrɛs(t)ˌplet/
  護胸甲,腹甲,胸革帶
  Breast·plate n.
  1. A plate of metal covering the breast as defensive armor.
     Before his old rusty breastplate could be scoured, and his cracked headpiece mended.   --Swift.
  2. A piece against which the workman presses his breast in operating a breast drill, or other similar tool.
  3. A strap that runs across a horse's breast.
  4. Jewish Antiq. 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.
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  breastplate
       n : armor plate that protects the chest; the front part of a
           cuirass [syn: aegis, egis]
  Breastplate
     (1.) That piece of ancient armour that protected the breast.
     This word is used figuratively in Eph. 6:14 and Isa. 59:17. (See ARMOUR.)
       (2.) An ornament covering the breast of the high priest, first
     mentioned in Ex. 25:7. It was made of embroidered cloth, set
     with four rows of precious stones, three in each row. On each
     stone was engraved the name of one of the twelve tribes (Ex.
     28:15-29; 39:8-21). It was in size about ten inches square. The
     two upper corners were fastened to the ephod by blue ribbons. It
     was not to be "loosed from the ephod" (Ex. 28:28). The lower
     corners were fastened to the girdle of the priest. As it
     reminded the priest of his representative character, it was
     called the memorial (28:29). It was also called the breastplate
     of judgment (28:15). (See PRIEST.)