hermetic

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hermetic

 [her-met´ik]
impervious to the air.

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.

hermetic

/her·met·ic/ (her-met´ik) impervious to air.

hermetic

[hərmet′ik]
Etymology: Gk, Hermes
from use in alchemy, pertaining to sealing a container so as to make it airtight.

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.

hermetic

impervious to the air.