| n. | 1. | A piece of leather stuffed or padded, worn by fencers to protect the breast. |
| 3. | (Anc. Armor) An iron breastplate, worn under the hauberk. | |
| 3. | (Anat.) 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. |
| Noun | 1. | plastron - the ornamental front of a woman's bodice or shirt |
| 2. | plastron - the front of man's dress shirt | |
| 3. | plastron - a metal breastplate that was worn under a coat of mail | |
| 4. | plastron - a large pad worn by a fencer to protect the chest | |
| 5. | plastron - (zoology) the part of a turtle's shell forming its underside |