Lamb"da*cism (?), n. [L. lambdacismus, Gr. , fr. la`mbda the letter lambda (1.
A fault in speaking or in composition, which consists in 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 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; as, Amelican for American.
© Webster 1913.