The final vowel of a word consisting of more than two syllables in lengthened before the affix mat when it is a name, but not of the words ajir etc.,
Thus उदुम्बरावती, मशकावती, वीरणावती, पुष्करावती, अमरावती ॥ These are formed by the affix मतुप् 4.2.85 The मत् is changed to वत्, by 8.2.11. Why do we say 'of a word consisting of more than two syllables'? Observe व्रीहिमती ॥ Why 'with the exception of अजिर &c'. Observe अजिरवती, खदिरवती, पुलिनवती, हंसकारण्डवती, चक्रवाकवती ॥ When the word is not a name, there is no lengthening, as वलयवती ॥
1 अजिर, 2 खदिर, 3 पुलिन, 4 हंस, 5 कारण्डव (हंसकारण्डव) 6 चक्रवाक.,