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hermetic
01
completely sealed against the entry or escape of air
Examples
The scientist stored the samples in hermetic containers to prevent contamination.
Make sure the jar is hermetic before placing it in the fridge.
02
related to an ancient mystical, alchemical, and esoteric tradition attributed to Hermes Trismegistus
Examples
The scholar studied hermetic texts to unlock the secrets of ancient alchemy.
She wore a pendant inscribed with hermetic symbols believed to protect against evil spirits.
