An Airtight Seal Is Also Known as This

This page is the CodyCross answer for the clue below from Campsite Adventures, Group 839, Puzzle 5 (Midnight Swim).

Question is: An Airtight Seal Is Also Known as This

and the answer is: HERMETIC

Word Meaning:

HERMETIC — (chiefly capitalized, Greek mythology) Pertaining to the ancient Greek Olympian god Hermes.

Definitions from Wiktionary.