English Lexicon

Plastron

/ˈplæs.trən/
nounCEFR C1 (Advanced)Top #28500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    The ventral or lower part of the shell of a turtle or tortoise.

    "The researcher carefully measured the length and width of the turtle's plastron."
  2. 2

    A protective pad worn on the chest by fencers to guard against hits.

    "Before putting on his jacket, the fencer strapped on his heavy leather plastron."

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Linguistic Origin & Historical Etymology

Derived from the French word 'plastron', meaning a breastplate or fencing pad, which itself stems from the Italian 'piastrone', an augmentative of 'piastra' (breastplate, metal plate). Entering English in the 19th century, the term initially referred to protective fencing gear before being adopted into zoology and anatomy for the ventral part of a turtle shell or similar protective chest structures.

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