Pronunciation: (plas'trun),[key] —n. 1. a piece of plate armor for the upper part of the torso in front.
2. Fencing.a quilted pad worn over part of the torso, for protection.
3. an ornamental front piece of a woman's bodice.
4. the starched front of a shirt.
5. Zool.the ventral part of the shell of a turtle.