Self-sealing Definition

sĕlfsēlĭng
adjective
Capable of sealing itself, as after being pierced.
A self-sealing tire.
American Heritage
Containing, or composed of, a substance that automatically seals punctures, etc.
A self-sealing tire.
Webster's New World
That can be sealed by pressure alone.
A self-sealing envelope.
Webster's New World
Sealable without the application of moisture.
A self-sealing envelope.
American Heritage

Describing a container that is capable of automatically closing off leaks that form in it.

One thing that saved many pilot's lives during World War II was salf-sealing gas tanks that kept their planes from becoming fireballs when riddled with bullets.
Wiktionary
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