An airtight seal is a seal that is very tight, so that no air can get in or out. This is important for things like containers and boxes, because it prevents things from spoiling.
The jar was airtight, which is why the food didn't spoil.
The seal on the container was airtight, which is why the food was safe to eat.
adjective
having no weak points
Synonyms:
adjective
not allowing air or gas to pass in or out
Synonyms:
1
The hull is water sealed and airtight.
2
The hull is water sealed and airtight.
3
The container is sealed at the top with an airtight alumina lid.
4
The bags are usually sealed airtight to keep the squid chewy and tough.
5
The innermost coffin was airtight and of metal.
6
The logic here is pretty airtight.
7
The airtight case is vented to the static port.
8
The shell of this ball is quite thick, and is completely airtight.
9
The case around the diaphragm is airtight and is vented to the static port.
10
The pattern member and the airtight bag are united in a single body.