thick ‧ ness /ˈθɪknəs, ˈθɪknɪs/ BrE AmE noun
[ Word Family: noun : ↑ thick , ↑ thickness , ↑ thickener , thickening, ↑ thicko ; verb : ↑ thicken ; adverb : ↑ thickly ; adjective : ↑ thick ]
1 . [uncountable and countable] how thick something is:
The thickness of the walls is 5 feet.
2 . [countable] a layer of something
thickness of
Wrap the cake in a double thickness of foil.