adjective Zoology.
of or pertaining to a plastron.

1885–90; plastr(on) + -al1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plastron (ˈplæstrən)
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Variation in the plastral formulae of selected turtles with comments on taxonomic utility.
Hatchlings have three dorsal keels and two plastral ones.
Plastral pumping may cause the airway to block, thus prohibiting air from entering the lungs.
Comparison of the plastral formulas provides distinction between the two species.
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