noun plas·tron \ˈplas-trən\

Definition of PLASTRON

a :  a metal breastplate formerly worn under the hauberk
b :  a quilted pad worn in fencing to protect the chest, waist, and the side on which the weapon is held
:  the ventral part of the shell of a tortoise or turtle consisting typically of nine symmetrically placed bones overlaid by horny plates
a :  a trimming like a bib for a woman's dress
b :  dickey 1a
:  a thin film of air held by water-repellent hairs of some aquatic insects

Origin of PLASTRON

Middle French, from Old Italian piastrone, augmentative of piastra thin metal plate — more at piastre
First Known Use: circa 1507


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