coating
n. C / U B2 Upper Intermediate US //ˈkoʊtɪŋ// UK //kˈəʊtɪŋ// coat·ing
n. a thin layer of something that covers a surface. You use this to describe things like paint on a wall or sugar on a cake.
n. a thin layer of a substance covering a surface for protection, decoration, or functional purposes.
The car has a shiny silver coating.
The technician applied a waterproof coating to the outdoor wires to prevent rust during the rainy season.
A specialized non-stick coating allows the medical device to pass through the artery without causing friction or damaging the delicate vessel walls.
Usage
Countable when referring to a specific layer; uncountable when discussing the material or the act of covering.