The PIE form of these words can't include *dhzht
because their outcomes often show *t>0, leaving the
other as dh, not *dhzh.
The cluster dhtr was simplified to dhr in many
languages and then this word's irregular paradigm
underwent analogy in each:
èn 'into'
èn+dh+ì > n,dhì 'down (to), low, under, etc.'
(e)_ndhtèró+s (e)_ndhtr(e)+ 'lower, etc.'
so:
(e)_ndhtèró+s (e)_ndhtr+ > (e)_nttèró+s (e)_ndhr+
analogy>
(e)_nttèró+s (e)_nttr+ OR (e)_ndhèró+s (e)_ndhr+
Seen in:
*_n,dhèró+s > under; Skt ádhara-
*(e)_ndhèró+s (e)_ndhr+ > *endh(e)ro+ >
Latin i:nferus, i:nfra:
*e_nttr+ > *enstro+s, etc., > *entsro+s >
*entso+s > *insso+s > OIr ís
*+Lo+ > OIr ísel
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