6.4.77

अचि श्नुधातुभ्रुवां य्वोरियङुवङौ

लघुसिद्धान्तकौमुदी 198 · प्रकरण 5, which opens at अर्थवदधातुरप्रत्ययः प्रातिपदिकम् · rule 84 of 100 in it

before a vowel, the इ/उ of श्नु-stems, of ई/ऊ-final roots and of भ्रू become इयङ् and उवङ्

Before a vowel affix, a final इ or ई becomes इयङ् (इय्) and a final उ or ऊ becomes उवङ् (उव्), for three things: a stem ending in the affix श्नु, a root (धातु) ending in ई or ऊ, and भ्रू, 'brow'. So भू, 'earth' and inside a building 'floor', a monosyllabic root in ऊ, gives भुवः in the nominative plural — भू + अस् → भुव् + अस्. The rule is why भू declines भूः, भुवौ, भुवः and does not lose its vowel before the ending; it keeps a monosyllable's final इ/उ standing as a full syllable.

• Aṣṭādhyāyī — 6.4.77 अचि श्नुधातुभ्रुवां य्वोरियङुवङौ
• Bālānandinī (LSK, Telugu) — सूत्र 198 in the abridgement; vendor/balanandini-lsk-telugu-ocr.txt

uncheckeddrafted from the rule text and the Bālānandinī

वरदराज writes under it

श्नु प्रत्ययान्तस्येवर्णोवर्णान्तस्य धातोर्भ्रू इत्यस्य चाङ्गस्येयङुवङौ स्तोऽजादौ प्रत्यये परे। इति प्राप्ते -