उदात्तयणो हल्पूर्वात्

Thus क॒॒र्तृ꣡ + ई = क॒॒र्त्री꣡; क॒॒र्त्रा꣡, ह॒॒र्त्री꣡, ह॒॒र्त्रा꣡, प्र॒॒ल॒॒वि॒॒त्री꣡, प्रलवित्रा꣡ ॥ प्र॒॒स॒॒वि॒॒त्री꣡, प्र॒॒स॒॒वि॒॒त्रा꣡ ॥ All these are तृच् ending words and have consequently acute accent on the final 6.1.63. Why 'acutely accented final vowel is replaced &c'? Observe क꣡र्त्री, क꣡र्त्रा, ह꣡र्त्री, ह꣡र्त्रा, formed by तृन् having acute on the first syllable. Why do we say 'preceded by a consonant'? Observe बहुतित॒॒उ꣡ — बहुतित॒॒वा॑ ब्राह्मण्या 8.2.4 बहूनि तितऊनि अस्या इति बहुव्रीहिः ॥ This compound with बहु gets udatta on the final by 6.2.175. In making the Instrumental singular of बहुतितउ, the उ is replaced by व्, but as this व् is preceded by a vowel, the affix gets the svarita accent.

Vart:- The rule applies when the stem ends in न् though not in a semi-vowel, as वाक्पत्नी꣡, चित्प॒॒त्नी꣡ ॥,