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sigmatic
sigmatic adj. 
/sɪɡˈmætɪk/ characterized by the addition of sigma or s to the stem.
/sɪɡˈmætɪk/ characterized by the addition of sigma or s to the stem.ΘΚΠ
society > communication > writing > manner of writing > [adjective] > sigma or s added to word
sigmated1849
sigmatic1888
1888 J. E. King & C. Cookson Princ. Sound & Inflexion Greek & Lat. xv. 444 The inflexions of the sigmatic aorist.
1897 Trans. Philol. Soc. 233 We have also a subjunctive of the sigmatic aorist.
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