You searched for: “hermetically
hermetically (adverb), more hermetically, most hermetically
A container or space which is so tightly closed that no air can leave it or go into it: When Sally and Sam went shopping, they purchased some hermetically sealed bags of food.

Mark purchased the hermetically sealed container which wouldn't allow any air or fluid to enter it when closed.

This entry is located in the following unit: herm-, herme- (page 2)