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plastron

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noun plas·tron \ˈplas-trən\

Definition of plastron

  1. 1 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

  2. 2 :  the ventral part of the shell of a tortoise or turtle consisting typically of nine symmetrically placed bones overlaid by horny plates

  3. 3 a :  a trimming like a bib for a woman's dress b :  dickey 1a

  4. 4 :  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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