her‧met‧ic‧ally /həˈmetɪkli $ hər-/
adverb technical[
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 sealed very tightly closed so that air cannot get in or out
Synonym : airtight—hermetic adjective [TahlilGaran] Dictionary of Contemporary English ▲