/ Dictionary / Index H hermetic: Meaning and Definition of Find definitions for: her•met•ic Pronunciation: (hûr-met'ik), [key] — adj. made airtight by fusion or sealing. not affected by outward influence or power; isolated. (sometimes cap.) of, pertaining to, or characteristic of occult science, esp. alchemy. (cap.) of or pertaining to Hermes Trismegistus or the writings ascribed to him. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hermetic (Thesaurus) Hermes Trismegistus hermetically Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language