lambdacism

noun
lamb·​da·​cism | \ ˈlam-də-ˌsiz-əm How to pronounce lambdacism (audio) \

Medical Definition of lambdacism

1 : excessive use of the letter l or the sound \l\ (as in alliteration)
2 : a defective articulation of \l\, the substitution of other sounds for it, or the substitution of \l\ for another sound — compare lallation sense 2, paralambdacism

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