selfsealing

self-sealing

[self-see-ling, self-]
adjective
capable of sealing itself automatically or without the application of adhesive, glue, or moisture: a self-sealing automobile tire; self-sealing envelopes.

Origin:
1920–25

self-sealer, noun
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World English Dictionary
self-sealing
 
adj
(esp of an envelope) designed to become sealed with the application of pressure only

Collins English Dictionary - Complete & Unabridged 10th Edition
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