[ plas-truh n ]
/ ˈplæs trən /


a piece of plate armor for the upper part of the torso in front.
Fencing. a quilted pad worn over part of the torso, for protection.
an ornamental front piece of a woman's bodice.
the starched front of a shirt.
Zoology. the ventral part of the shell of a turtle.

Origin of plastron

1500–10; < Middle French < Italian piastrone, augmentative of piastra metal plate, piaster. See plaster Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for plastron

British Dictionary definitions for plastron


/ (ˈplæstrən) /


the bony plate forming the ventral part of the shell of a tortoise or turtle

Derived Forms

plastral, adjective

Word Origin for plastron

C16: via French from Italian piastrone, from piastra breastplate, from Latin emplastrum plaster
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012