assibilate

verb
as·​sib·​i·​late | \əˈsibəˌlāt, aˈ-, usually -āt + V\
-ed/-ing/-s

Definition of assibilate 

transitive verb

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\)

intransitive verb

: 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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History and Etymology for assibilate

ad- + sibilate

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