lambdacism Hear it!

lambdacism Definition

lamb·da·cism (lamdə siz′əm)

noun

substitution of the sound (l) for another sound, esp. (r), or of another sound, esp. (r), for (l)

Etymology: LL lambdacismus < Gr lambdakismos < lambdakizein, to pronounce l imperfectly < lambda, lambda