'non-coated' is a compound formed from the prefix 'non-' and the past-participle adjective 'coated'. 'non-' originates from Latin 'non' meaning 'not', used in English as a combining form to negate or indicate absence.

'coated' derives from the verb 'coat', which comes from Old French 'cote' (a tunic or outer garment) and Medieval Latin 'cotta'. The sense of 'coat' extended from a garment to any covering or layer (for example, a layer of paint). The compound 'non-coated' is a Modern English formation using the negative prefix 'non-' plus the past-participle adjective.

Originally 'coat' primarily referred to a garment; over time its meaning broadened to mean any covering or layer. Consequently, 'non-coated' now means 'not covered by a layer or coating' rather than 'not wearing a garment'.