san·dhi (sān'dē, sän'-) n. Modification of the sound of a word or morpheme when juxtaposed with another, especially in fluent speech, as the modification of the pronunciation of don't in don't you from its pronunciation in isolation or in a phrase like don't we.
[Sanskrit saṃdhiḥ, union, sandhi : sam, together; see sem-1 in Indo-European roots + dadhāti, dhī-, he places; see dhē- in Indo-European roots.]