Definition of assibilate
1 : to introduce a sibilant sound after or less often before z was an assibilated d in primitive Greek—either \dz\ or \zd\
2 : to convert to or replace by a sibilant sound or a sound of which a sibilant is one constituent (as when the pronunciation \ˈindyən\ for Indian becomes \ˈinjən\; \j\ = \d\ + \zh\)
: to change by introducing a sibilant sound (noninitial) Indo-European ti (unless preceded by s) assibilates (through palatalization) to si — G. U. Bonfante
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Origin and Etymology of assibilate
ad- + sibilate
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