The Collaborative International Dictionary of English v.0.48:
cunnilingus \cun`ni*lin"gus\ n. [NL., fr. L. cunnus vulva + lingere to lick.] Stimulation of the vulva or clitoris of one person by the tongue of another, for the purpose of giving sexual gratification. Syn: cunnilinctus. [WordNet 1.5]WordNet (r) 3.0 (2006):
cunnilingus n 1: oral stimulation of the vulva or clitoris [syn: cunnilingus, cunnilinctus]