The terms seṭ and aniṭ refer to classes of roots in Sanskrit grammar. In the terminology of Panini, seṭ (from sa-iṭ, Aṣṭādhyāyī 1.2.18, 6.4.121)) means "with an i-sound), and an-iṭ (Aṣṭādhyāyī 3.1.45, 6.1.188, 6.4.51, 7.2.61) means "without an i-sound". The i sound in question is a phoneme i that appears in certain morphological circumstances for certain, lexically defined roots, regularly continuing PIELaryngeals.
The primary difference between the two classes is the aorist-marker. While aniṭ-roots form aorist with the -s suffix, seṭ-roots are suffixed by -iṣ.
