fellatio

The word 'fellatio' is a modern English noun directly borrowed from the Late Latin term fellātiō, which itself is derived from the Latin verb fellāre ('to suck'). The suffix -tiō (stem: -tiōn-) is a common Latin nominalization ending used to form abstract nouns denoting an action. The term entered scholarly and later general English vocabulary in the 19th century, retaining its precise anatomical and behavioral meaning from its classical Latin root. Its formation follows a standard Latin pattern where a verb stem is combined with an action-noun suffix to create a specific technical term.

Structure: fellat (suck) + io (noun suffix) The morpheme 'fellat' originates from the Latin verb fellāre, meaning 'to suck'. The suffix '-io' is a Latin noun-forming suffix indicating an action or process.