1. the lower shell or belly plate of a turtle or tortoise
Usage: zoology
2. a padded chest protector worn in fencing
Usage: fencing; sports equipment
3. the front part of a dress shirt or formal shirt worn with evening wear
Usage: formal wear; fashion

Examples

• The turtle’s plastrons were marked with distinctive yellow patterns.
• She examined the fossil plastrons to identify the ancient turtle species.
• The fencer adjusted his plastrons before the match began.
• New plastrons are required for all tournament participants.
• His tuxedo featured elegant plastrons with pearl buttons.
• The formal plastrons were starched and perfectly pressed.
• Marine biologists study plastrons to understand turtle anatomy.