Translation guide
The English word 'plastron' has several distinct meanings: a piece of armor, a part of a turtle shell, a fencing guard, and a clothing front. This guide covers how to express each of these in Japanese.
The flat underside of a turtle or tortoise shell.
The standard biological term for the plastron, the ventral part of a turtle's shell.
The turtle's plastron is flat.
A more descriptive, everyday phrase meaning 'belly shell'. Less technical than 腹甲.
This turtle has a yellow plastron.
The protective chest pad worn in fencing.
A metal breastplate or chest plate, part of a suit of armor.
The starched front of a man's formal shirt, or a decorative front piece on a garment.
胸当てを忘れずに。
Don't forget your chest protector.
その胸当ては鉄でできている。
That plastron is made of iron.