hermetic

her·met·ic  (hr-mtk) also her·met·i·cal (--kl)

adj.

1. Completely sealed, especially against the escape or entry of air.

2. Impervious to outside interference or influence: the hermetic confines of an isolated life.

3. often Hermetic

a. Mythology Of or relating to Hermes Trismegistus or the works ascribed to him.

b. Having to do with the occult sciences, especially alchemy; magical.

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[New Latin hermticus, alchemical, from Medieval Latin Herms (Trismegistus); see Hermes Trismegistus.]

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her·meti·cal·ly adv.

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hermetic

Adjective

sealed so as to be airtight [after the Greek god Hermes, traditionally the inventor of a magic seal]

hermetically adv

Thesaurus

Adj.

1.

hermetic - completely sealed; completely airtight tight - of such close construction as to be impermeable; "a tight roof"; "warm in our tight little house"