2 Words to use with airtight

When fruit is preserved with a large amount of sugar (a pound of sugar to a pound of fruit) it does not need to be sealed in airtight jars; because bacteria do not readily form in the thick, sugary syrup.

If Nature had meant man to think, she would not have given him ears; or, at any rate, she would have furnished them with airtight flaps, such as are the enviable possession of the bat.

2 Words to use with  airtight