'hermetic' originates from Greek, specifically the word 'Hermes,' where 'Hermes Trismegistus' was associated with alchemy and sealing secrets.

'Hermes' transformed into the Latin word 'hermeticus,' and eventually became the modern English word 'hermetic' through Middle English.

Initially, it meant 'related to alchemy or the occult,' but over time it evolved into its current meaning of 'airtight or sealed.'