Vṛddhi

Vṛddhi (also rendered vr̥ddhi) is a technical term in morphophonology given to the strongest grade in the vowel gradation system of Sanskrit and of Proto-Indo-European. The term is derived from Sanskrit वृद्धि vṛddhi, IPA: [ˈʋr̩d̪ːʱi], lit. 'growth', from Proto-Indo-European *werdʰ- 'to grow'.