Definition: a reputed ancient grammarian who is identified with Katyayana, the prominent author of the Varttikas on the Sutras of Panini. Both the names वररुचि and कात्यायन are mentioned in commentary works in connection with the Varttikas on the Sutras of Panini, and it is very likely that Vararuci was the individual name of the scholar, and Katyayana his family name. The words कात्य and कात्यायन are found used in Slokavarttikas in the Mahabhasya on P.III.2.3 and III.2.118 where references made are actually found in the prose Varttikas (see कविधेो सर्वत्र प्रसारणिभ्यो ड: P.III. 2. 3 Vart and स्मपुरा भूतमात्रे न स्मपुराद्यतने P.III.2.118 Vart. 1)indicating that the Slokavarttikakara believed that the Varttikas were composed by Katyayana. There is no reference at all in the Mahabhasya to Vararuci as a writer of the Varttikas; there is only one reference which shows that there was a scholar by name Vararuci known to Patanjali, but he was a poet; cf. वाररुचं काव्यं in the sense of 'composed' (कृत and not प्रोक्त) by वररुचि M.Bh. on P. IV. 2.4. (2) वररुचि is also mentioned as the author of the Prakrta Grammar known by the name प्राकृतप्रकाश or प्राकृतमञ्जरी, This वररुचि, who also was कात्यायन by Gotra name, was a grammarian later than Patanjali, who has been associated with Sarvvarman, (the author of the first three Adhyayas of the Katantra Sutras), as the author of the fourth Adhyaya. Patanjali does not associate वररुचि with Kityayana at alI. His mention of वररुचि as a writer of a Kavya is a sufficient testimony for that. Hence, it appears probable that Katyayana, to whom the authorship of the Vajasaneyi Pratisakhya and many other works allied with Veda has been attributed, was not associated with Vararuci by Patanjali, and it is only the later writers who identified the grammarian Vararuci,who composed the fourth Adhyaya of the Katantra Grammar and wrote a Prakrit Grammar and some other grammar' works, with the ancient revered Katyayana, the author of Varttikas, the Vijasaneyi Pratisakhya and the Puspasutra; (3) There was a comparatively modern grammariannamed वररुचि who wrote a small treatise on genders of words consisting of about 125 stanzas with a commentary named Lingavrtti, possibly written by the author himself. (4) There was also another modern grammarian by name वररुचि who wrote a work on syntax named प्रयोगमुखमण्डन discuss＾ ing the four topics कारक, समास, तद्धित and कृदन्त.