'coating' originates from the verb 'coat,' which comes from the Old French word 'cote,' meaning 'a coat or covering.'

'cote' transformed into the Middle English word 'cote,' and eventually became the modern English word 'coat,' from which 'coating' is derived.

Initially, it meant 'a garment or covering,' but over time it evolved into its current meaning of 'a layer or covering of a substance.'