The word 'uncoated' is a modern English formation built from established morphemes. The core noun 'coat' traces back to the Latin cotta, a type of tunic, which evolved in Old French to denote an outer garment and later any covering layer. The Germanic negative prefix 'un-' is one of the most prolific in English, directly reversing the quality of the root it attaches to. The suffix '-ed' is added to the noun 'coat' to form the adjective 'coated,' meaning "having a coat or covering." Therefore, 'uncoated' logically and transparently means "not having a coat or covering," a meaning directly assembled from its constituent parts.

Structure: un (not) + coat (covering layer) + ed (adjective suffix) - un: A prefix of Germanic origin (Old English un-), meaning "not." It functions as a negative particle. - coat: A root of Latin origin (via Old French cote), meaning a covering layer or outer garment. It functions as the core noun. - ed: A suffix of Germanic origin (Old English -ed, -od), originally forming past participles of verbs, now commonly used to create adjectives meaning "having the quality of."