sigmatism means A lisp. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
sigmatism is pronounced /ˈsɪɡməˌtɪzəm/.
Etymology
From sigma + -ism. sigmat- is the stem form of sigma, as seen in sigmatic.
noun
- A lisp.
- A defective pronunciation of sibilant sounds.“The flaw in pronouncing a sibilant S, which speech therapists call sigmatism, can follow even minor changes to the way the tongue aligns with the teeth.”