closedcell
adjectiveUK /ˌkləʊzd ˈsel/
US /ˌkloʊzd ˈsel/
A closed-cell thing has tiny sealed bubbles inside that keep air or water from getting in.
The pool noodle is made of closed-cell foam, so it does not soak up water.
RELATED WORDS
OTHER MEANINGS
2. Describing a foam or material whose tiny pockets are fully enclosed, making it float and resist moisture.
Closed-cell foam is used in life jackets because it stays buoyant.
3. Describing insulation that traps air in sealed pockets to keep heat in or out.
They sprayed closed-cell insulation under the roof to save energy.
4. Describing a structure in biology where each small unit is completely walled off from its neighbors.
The plant's closed-cell tissue forms a tight protective layer.