Sigmatism

//ˈsɪɡməˌtɪzəm// noun

Definitions

Noun
  1. 1
    A lisp. countable, uncountable
  2. 2
    A defective pronunciation of sibilant sounds. countable, uncountable

    "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."

Etymology

From sigma + -ism. sigmat- is the stem form of sigma, as seen in sigmatic.

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