Plastron
Plastron , noun
[French plastron breastplate, plastron, Late Latin plastra a thin plate of metal. See Plaster.]
1.
A piece of leather stuffed or padded, worn by fencers to protect the breast. — Dryden
3.
(Anc. Armor) An iron breastplate, worn under the hauberk.
3.
(Anatomy) The ventral shield or shell of tortoises and turtles. See Testudinata.
4.
A trimming for the front of a woman's dress, made of a different material, and narrowing from the shoulders to the waist.