plastron (n.)

  1. the ornamental front of a woman's bodice or shirt

  2. the front of man's dress shirt

  3. a metal breastplate that was worn under a coat of mail

  4. a large pad worn by a fencer to protect the chest

  5. (zoology) the part of a turtle's shell forming its underside

The dictionary is based on the WordNet Electronic Lexical Database.
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