hermetic
adjective
[ həːˈmɛtɪk ]
• (of a seal or closure) complete and airtight.
• "a hermetic seal that ensures perfect waterproofing"
• relating to an ancient occult tradition encompassing alchemy, astrology, and theosophy.
• "some saw in the Hermetic texts an anticipation of Christianity"
Origin:
mid 17th century (in hermetic (sense 2)): from modern Latin hermeticus, from Hermes, identified with Thoth, regarded as the founder of alchemy and astrology.
