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Webster's Dictionary (1865)

Plăs'tron, n.

noun

n. [Fr. plastron, breastplate, plastron, It. piastrone, from It. piastra, L. Lat. plastra, a thin plate of metal. See PLASTER.]

  1. A piece of leather stuffed;—used by fencers to defend the body against pushes. Dryden.
  2. (Physiol.) The ventral or under shield or shell of the tortoise and similar animals. Carpenter.