2559: Sigmatism Dec 15, 2021

Although many conditions and linguistic phenomena are named with a Greek letter plus '-cism', they aren't always named for the same reasons. 'Sigmatism', like 'lambdacism' describes a speech impediment that regularly affects one sound, in this case [s], though that can denote either the over- or underproduction of it. This can be an appropriate term to describe the effect of a lisp, though not necessarily.