sandhi

noun

san·​dhi ˈsan-dē  ˈsän-  ˈsən- 

: modification of the sound of a morpheme (such as a word or affix) conditioned by syntactic context in which it is uttered (such as pronunciation of -ed as \d\ in glazed and as \t\ in paced or occurrence of a in a cow and of an in an old cow)

Word History

Etymology

Sanskrit saṁdhi, literally, placing together

First Known Use

1806, in the meaning defined above