a speech defect in which l is pronounced instead of r, or in which an l-sound is mispronounced.
Origin of lallation
1640–50; < Latin lallā(re) to sing lala or lullaby + -tion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
phonetics a defect of speech consisting of the pronunciation of (r) as (l)
Word Origin for lallation
C17: from Latin lallāre to sing lullaby, of imitative origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012