schlintement

lateral lisp

“Avec le sigmatisme, le schlintement est une des dyslalies les plus communement observées.” — Along with sigmatism, schlintement is one of the most commonly observed dyslalias.

Probably based on German Schetismus (“lateral lisp”, literally “schet-ism”), itself based on the Hebrew letter ש, in an analogous manner to other forms of dyslalia on Greek letters, e.g. Lambdazismus.