Lăm'bda-cĭsm, n.

(lăm'da-sĭzm), n. [Lat. lambdacismus, Gr. λαμβδακισμός, from λάμβδα, the letter Λ.]

1. A fault in speaking or in composition, which consists in the too frequent use of the letter l, or in doubling it erroneously.
2. A defect in pronunciation of the letter l when doubled, which consists in giving it a sound as if followed by a y, similar to that of the letters lli in billion.
3. The use of the sound of l for that of r in pronunciation; lallation.