PLASTRON

noun
10 Scrabble
13 WWF
P 3
L 1
A 1
S 1
T 1
R 1
O 1
N 1

Definition

The nearly flat part of the shell structure of a tortoise or other animal, similar in composition to the carapace.

"The plastron of a diving beetle is not directly a source of oxygen, but acts as a gill, acquiring oxygen from the surrounding water."

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