In the chandas (Vedas) the affixes tara and tama get the augment nuṭ after a stem in n,
The affixes तरप् and तमप् are called घ ॥ Thus सुपथिन् + तर = सुपथि + तर 8.2.7 = सुपथि + न्तर 8.2.17 = सुपथिन्तरः ॥ So also दस्युहन्तमः ॥
Vart:- The augment तुट् is added to these affixes after भूरिदावन्; as भूरिदावत्तरः (3.2.74, the affix is वनिप्).
Vart:- Long ई is the substitute of the final of रथिन् before तर and तम ॥ The word रथिन् is formed by the affix इनि in the sense of मतुप् ॥ The final न् is first elided by 8.2.7, and then for the short इ of रथि the long ई is substituted by the present vartika. If the long ई were substituted for the final न् of रथिन् as रथिई + तर, then this long ई being asiddha, it could not be compounded by ekadesa with the preceding इ into ई, and the form would always remain रथिईतरः ॥ As रथीतरः, and रथीतमं रथीनाम् ॥ Or this ई may be considered to have come after रथ in the sense of मतुप् ॥,
