sigmatism

[ sig-muh-tiz-uh m ]
/ ˈsɪg məˌtɪz əm /
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noun

defective pronunciation of sibilant sounds.

Origin of sigmatism

1885–90; < Greek sigmat-, stem of sígma sigma + -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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