163. Before h

Before ह् h (the case occurs only in external combination), a final mute is made sonant; and then the ह् h may either remain unchanged or be converted into the sonant aspirate corresponding with the former: thus, either तद्हि tád hí or तद्धि tád dhí.

a. In practice, the latter method is almost invariably followed; and the grammarians of the Prātiçākhya period are nearly unanimous in requiring it. The phonetic difference between the two is very slight.

Examples are: vā́g ghutáḥ, ṣáḍḍhotā (ṣaṭ + hotā), taddhita (tat + hita), anuṣṭúb bhí.