Definition: name of an ancient grammarian with a sound scholarship in Vedic phonetics, accentuation,derivation of words and their interpretation. He is believed to have been a relative and contemporary of Panini and to have written a very scholarly vast volume on Sanskrit grammar named *Samgraha which is believed to have consisted of a lac of verses; cf. संग्रहो व्याडिकृतो लक्षसंख्ये ग्रन्थ: NageSa's Uddyota; cf. also इह पुरा पाणिनीये अस्मिन्व्याकरणे ब्याड्युपरचितं लक्षग्रन्थपरिमाणं निबन्धनमासीत् Vak. Pad. Tika. The work is not available at present. References to Vyadi or to his work are found in the Pratisakhya works, the Mahabhasya, the Varttikas, the Vakyapadiya and many subsequent treatises. A work on the Vyakarana Paribhasas, believed to have been written by Vyadi, is available by the name परिभाषासूचन which from its style and other peculiarities seems to have been written after the Varttikas, but before the Mahabhasya. Vyadi is well-known to have been the oldest exponent of the doctrine that words denote an individual object and not the genus. For details see pp. 136-8, Vol. 7 Vyakarana Mahabhasya DE. Society's Edition.