|part of speech:
||preventing or sealed to prevent the influx or escape of air; airtight.
The hermetic seal between the two panes of glass keeps air from entering between them.
||protected from external pressures or influences.
It was easy to forget about the war on this hermetic island.
||(sometimes cap.) relating to the occult sciences, esp. alchemy.
His interest extended beyond what we would call science into areas of the Hermetic Arts.
||hermetical (adj.), hermetically (adv.)