Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Modern Latin
Origin: hermeticus, from Hermes Trismegistus, a magician in ancient stories who invented a way of keeping air out of containers

hermetically

 adverb
     
her‧met‧ic‧ally technical
T

hermetically sealed

very tightly closed so that air cannot get in or out [= airtight]
—hermetic adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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