hermetic

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her|met|ic /hɜːrm'etɪk/
1 [ADJ] ADJ n
If a container has a hermetic seal, the seal is very tight so that no air can get in or out. (TECHNICAL)
= airtight
● hermetically [ADV] ADV -ed, ADV after v
The batteries are designed to be leak-proof and hermetically sealed.
2 [ADJ]
You use hermetic to describe something which you disapprove of because it seems to be totally separate from other people and things in society. (WRITTEN)
Its film industry operates in its own curiously hermetic way...
Their work is more cosily hermetic than ever.

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