Pāṇini sūtras

A short vowel is substituted in the Voc. Sg, for the ā of the feminine, in the sense of ‘mother, mother-dear’, as well as for the long vowel of the Feminines called Nadû (I.4.3 &c).

1. ambā+artha+nadyoḥअम्बा+अर्थ+नद्योः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	ambāअम्बा	ambāअम्बा	ambā [word]अम्बा [wओर्द्]	ambअम्ब् + plus āआ
   aअ	arthaअर्थ	arthaअर्थ	sense	arthअर्थ् + plus aअ
   nन्	nadīनदी	nadyoḥनद्योः	nadīनदी	nadनद् + plus yoḥयोः

2. hrasvaḥह्रस्वः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   hह्	hrasvaह्रस्व	hrasvaḥह्रस्वः	short	hrasvह्रस्व् + plus aḥअः

Anuvṛtti

1. sambuddhauसम्बुद्धौ 7·3·106

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	sambuddhiसम्बुद्धि	sambuddhauसम्बुद्धौ	vocative	sambuddhसम्बुद्ध् + plus auऔ