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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Self-sealing filling valves, suitable for use with fine aggregate concrete, shall be installed at predetermined locations.
The rubber also contains a self-sealing material to re-close small holes.
As the warm days of summer end, shingles are not warmed up enough to activate the self-sealing compound on the shingle.
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