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Wiktionary
anilingus

n. A form of oral sex in which the tongue and lips are used for stimulation of a sexual partner's anus.

Wikipedia
Anilingus

Anilingus (from the Latin anus + -lingus, from lingere, "to lick", variantly spelled "analingus","Alternate Spellings: Analingus.

The Spelling Controversy

There is extensive debate on whether analingus or anilingus is the correct spelling of the "technical" word for oral anal sex. Both terms have their adherents. Analingus appeals to many people because its meaning is quite clear, but dictionaries tend to only list anilingus as a proper spelling. Since the word is relatively new, either vowel choice is probably safe, and the spelling may be in the process of shifting from anilingus to analingus." Elizabeth Boskey, PhD https://www.verywell.com/anilingusanalingus-oral-anal-sex-3132790) is an oral and anal sex act where one person stimulates the anus of another person by the use of their mouth, including lips, tongue, or teeth. It is also referred to as anal–oral contact and anal–oral sex, or colloquially as rimming or a rim job, and may be performed by or on people of any sexual orientation for personal pleasure or as a form of erotic humiliation.