The plastron (plural: plastrons or plastra) is the nearly flat part of the shell structure of a turtle, what one would call the belly or ventral surface of the shell.

seashell, hard exoskeleton of marine mollusks such as snails, bivalves, and chitons that serves to protect and support their bodies. It is composed largely of calcium carbonate secreted by the …

English speakers first borrowed French's word for a breastplate, plastron, as the name for the protective plate worn under a tunic of [chain mail] (/dictionary/chain mail) by knights. In the …

Jul 21, 2025 · The plastron is the flat, bottom portion of a turtle or tortoise’s shell. It serves as the ventral, or underside, connecting to the upper part known as the carapace. This entire shell is …

Nov 7, 2025 · Total independence of atmospheric air is possible only if insects have a permanent gas store or incompressible gas gill, called a plastron. Unlike compressible gas stores, the …

The plastron, also known as the ventral shell, is the lower part of the turtle or tortoise shell. It is typically flat or slightly concave in shape, providing a stable base for the reptile.

The plastron is a half jacket that is worn under the fencing jacket to provide an additional layer of protection. The plastron, also known as underarm guard, is compulsory for fencers to wear …