plastron ( synonym found)
Definition of plastron:

(n) : the nearly flat part of the shell structure of a tortoise or other animal, similar in composition to the carapace; a half-jacket worn under the jacket for padding or for safety
Definition of plastron:

(n) : the nearly flat part of the shell structure of a tortoise or other animal, similar in composition to the carapace; a half-jacket worn under the jacket for padding or for safety
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