Etymology
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plastron (n.)

"breastplate," c. 1500, from French plastron "breastplate," from Italian piastrone, augmentative of piastra "breastplate, thin metal plate" (see piaster). As an animal part, from 1813; as an article of women's dress, 1876.

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Definitions of plastron

plastron (n.)
the ornamental front of a woman's bodice or shirt;
plastron (n.)
the front of man's dress shirt;
plastron (n.)
a metal breastplate that was worn under a coat of mail;
plastron (n.)
a large pad worn by a fencer to protect the chest;
plastron (n.)
(zoology) the part of a turtle's shell forming its underside;
From wordnet.princeton.edu