n. A square ornament worn by the Jewish high priest, consisting of the same textile fabric as the ephod, and bearing twelve precious stones engraved with the names of the twelve tribes of Israel, set in the gold.n. The armor for the front of the body, when made in one piece reaching from the waist to about the collar-bone.n. A strap that runs across a horse's breast.n. A plate or piece which receives the buttend of a boring-tool, and is held against the breast when the tool is in use. Also called conscience and palette.n. The sternum or central piece on the lower side of the cephalothorax of a spider, between the bases of the legs.n. The lower shell or plastron of a tortoise.n. The iron plate used for covering the breast-hole of a cupola.