- (esp of an envelope) designed to become sealed with the application of pressure only
WordReference Random House Unabridged Dictionary of American English © 2026
self-seal•ing
(self′sē′ling, self′-),USA pronunciation adj.
self′-seal′er, n.
- capable of sealing itself automatically or without the application of adhesive, glue, or moisture:a self-sealing automobile tire; self-sealing envelopes.
- 1920–25
Collins Concise English Dictionary © HarperCollins Publishers::
self-sealing adj