Hermetic (adjective)

Airtight, sealed, and designed to exclude air and other gases; related to alchemy or the occult.

Origin:

The word "hermetic" comes from the greek god hermes and alchemy which was known as hermeticism.

Examples:

1. The jar has a hermetic seal to keep the food fresh.
2. The lab used hermetic seals to keep the gases from escaping.
3. The hermetic teachings were passed down through secret societies.
4. Hermetic philosophy is an ancient tradition that combines elements of alchemy, astrology, and the occult.
5. The hermetic teachings were based on the works of the mythical figure Hermes Trismegistus.