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lallation

[la-ley-shuh n]
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noun Phonetics.
  1. a speech defect in which l is pronounced instead of r, or in which an l-sound is mispronounced.
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Compare lambdacism.

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. 2018

British Dictionary definitions for lallation

lallation

noun
  1. phonetics a defect of speech consisting of the pronunciation of (r) as (l)
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Word Origin

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