1. the front part of a turtle’s shell
Usage: biology
2. a padded chest protector worn in fencing
Usage: fencing
3. the front of a shirt or dress shirt, especially when starched or decorated
Usage: formal clothing

Examples

• The turtle’s plastron was marked with distinctive yellow patterns.
• She examined the crack in the box turtle’s plastron.
• The fencer adjusted his plastron before the match began.
• His white plastron gleamed beneath his formal jacket.
• The ornate plastron featured intricate embroidery.
• Marine biologists study plastron shapes to identify turtle species.