238. The guna-increment

The guṇa-increment is an Indo-European phenomenon, and is in many cases seen to occur in connection with an accent on the increased syllable. It is found—

a. In root-syllables: either in inflection, as dvéṣṭi from √dviṣ, dóhmi from √duh; or in derivation, as dvéṣa, dóhas, dvéṣṭum, dógdhum.

b. In formative elements: either conjugational class-signs, as tanómi from tanu; or suffixes of derivation, in inflection or in further derivation, as matáye from matí, bhānávas from bhānú, pitáram from pitṛ́ (or pitár), hantavyà from hántu.