plastron

[plas-truhn]
noun
1.
a piece of plate armor for the upper part of the torso in front.
2.
Fencing. a quilted pad worn over part of the torso, for protection.
3.
an ornamental front piece of a woman's bodice.
4.
the starched front of a shirt.
5.
Zoology. the ventral part of the shell of a turtle.

Origin:
1500–10; < Middle French < Italian piastrone, augmentative of piastra metal plate, piaster. See plaster

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Collins
World English Dictionary
plastron (ˈplæstrən)
 
n
the bony plate forming the ventral part of the shell of a tortoise or turtle
 
[C16: via French from Italian piastrone, from piastra breastplate, from Latin emplastrumplaster]
 
'plastral
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Pull the plastron away from the carapace as you cut skeletal muscle attachments.
In older individuals the plastron may be worn smooth and growth rings not as
  apparent.
The plastron is pale yellow with the scutes usually worn.
The plastron of males is concave, while females have a flat or slightly convex
  plastron.
Images for plastron
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