A submarine is a hermetic environment where no water can enter and no air can escape.
The parents thought their child would be safe from outside harm if they kept him inside a hermetic sphere of protection.
The storage container did not have a hermetic seal, so many of its contents were ruined during the storm.
A team of engineers specifically focused on ensuring the space shuttle was hermetic so that the passengers would stay safe.
Rebecca was curious about the occult group that performed hermetic practices in the town, but most people stayed away from them.
Devastated by his wife's death, John lived a hermetic life in his solitary cabin in the woods.