WordReference Random House Unabridged Dictionary of American English © 2017
lal•la•tion  (la lāshən),USA pronunciation n. [Phonet.]
  1. Phoneticsa speech defect in which l is pronounced instead of r, or in which an l- sound is mispronounced. Cf. lambdacism.
  • Latin lallā(re) to sing lala or lullaby + -tion
  • 1640–50

Collins Concise English Dictionary © HarperCollins Publishers::

lallation /læˈleɪʃən/ n
  1. a defect of speech consisting of the pronunciation of (r) as (l)
Etymology: 17th Century: from Latin lallāre to sing lullaby, of imitative origin

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