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Hermetic
A container that is hermetic is closed so that not even air can reach its contents. For example a tin (or can[?]).
This word comes from the greek god and mythological alchemist Hermes Trismegistus. He was known to possess a magic ability to seal (with spells) treasure chests so that nothing could access its contents. Alchemists also frequently used distillation in their experiments, and needed an airtight seal to improve the efficiency of their alembic[?] stills.
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