hermetic

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hermetic

 [her-met´ik]
impervious to the air.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

her·met·ic

(her-met'ik),
Airtight; denoting a vessel closed or sealed in such a way that air can neither enter it nor issue from it.
Farlex Partner Medical Dictionary © Farlex 2012

her·met·ic

(hĕr-met'ik)
Airtight; denoting a vessel closed or sealed in such a way that air can neither enter it nor issue from it.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012