- The nearly flat part of the shell structure of a tortoise or other animal, similar in composition to the carapace
- (fencing) A half-jacket worn under the jacket for padding or for safety.
- An ornamental front panel on a woman's bodice.
Etymology: From French plastron, from Italian piastrone, augmentive of piastra "breastplate", from Latin emplastrum "plaster", from Ancient Greek (polytonic, ), from (polytonic, ) "daubed, plastered", from (polytonic, ) "to mould, form".
- 1942: I bought here a wedding dress perhaps twenty or thirty years old ... a sequin to be worn over the womb as a feminine equivalent to a cod-piece, and a gauze veil embroidered in purple and gold. " Rebecca West, Black Lamb and Grey Falcon (Canongate 2006, p. 784)
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Full Definition of plastron