Relating to or involving fellatio; of or pertaining to oral sex involving the penis.
Formed from fellate plus the adjectival suffix -ory (like 'oratory' from 'orare'), creating an adjective form for describing acts or practices related to fellatio.
Fellatory is extremely rare in actual usage—most English speakers prefer just saying 'fellatio' as an adjective—showing that not every possible word formation actually gets adopted by speakers.
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