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Meaning of self-sealing

self-seal•ing

Pronunciation: (self"sē'ling, self'-), [key]
— adj.
  1. capable of sealing itself automatically or without the application of adhesive, glue, or moisture: a self-sealing automobile tire; self-sealing envelopes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.