Webster's English Dictionary

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plastron

plas.tron \'plas-tr*n\ n [MF, fr. OIt piastrone, aug. of piastra thin metal 
   plate - more a]t PIASTER 1a: a metal breastplate  1b: a quilted pad worn in 
   fencing practice to protect the chest  2: the ventral part of the shell of 
   a tortoise or turtle consisting typical ly of nine symmetrically placed 
   bones overlaid by horny plates 3a: a trimming like a bib for a woman's 
   dress  3b: DICKEY