Find the word definition

Wiktionary
self-sealing

a. 1 A device with seals that activate without special procedures. 2 Describing a container that is capable of automatically closing off leaks that form in it.

WordNet
self-sealing
  1. adj. capable of sealing itself as after being pierced; "self-sealing tires"

  2. seals without the application of moisture; "self-sealing envelopes"

Usage examples of "self-sealing".

The big radial tires it rolled on were of the self-sealing type favored by dictators in small, uneasy countries.