lime ‧ scale /ˈlaɪmskeɪl/ BrE AmE noun [uncountable] British English
a hard white or grey substance that forms on the inside of pipes, ↑ tap s, and water containers
lime ‧ scale /ˈlaɪmskeɪl/ BrE AmE noun [uncountable] British English
a hard white or grey substance that forms on the inside of pipes, ↑ tap s, and water containers
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012