anvyakṣara sandhi

 Anvyakṣara sandhi refers to the sandhi that occurs when a preverb (upasarga) or indeclinable (avyaya) joins with a following word, producing phonetic changes governed by standard vowel, consonant, or visarga sandhi rules.

What anvyakṣara means

The term anvyakṣara comes from avyaya (“indeclinable”) + akṣara (“syllable/letter”). It refers to sandhi that arises when an indeclinable word or prefix comes into contact with the next word.

Although the supplied results explain sandhi in general—vowel sandhi, consonant sandhi, and visarga sandhi

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—they do not mention this specific category. The concept is traditional rather than a separate Pāṇinian sandhi type.

Why this sandhi is discussed separately

Indeclinables (avyayas) such as pra, pari, ava, su, dus, nis, sam, api, iti, atha frequently combine with verbs or nouns. Because they end in vowels, consonants, or visarga, they regularly trigger standard sandhi rules, but grammarians sometimes group these cases under anvyakṣara sandhi to highlight that the sandhi arises at the junction of an avyaya and another word.

How it works

Anvyakṣara sandhi does not introduce new rules; it applies the usual sandhi mechanisms to the special case of indeclinables. The three major sandhi types described in the results—vowel (ac) sandhi, consonant (hal) sandhi, and visarga sandhi

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—all apply here.

Examples illustrate this clearly:

1. Vowel sandhi with indeclinables

• pra + eti → prayeti
  (standard yāṇ sandhi: a + e → ye)
• su + asti → svasti
  (u + a → va)
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2. Consonant sandhi with indeclinables

• sam + kr̥ta → saṅkr̥ta
  (anusvāra sandhi: m before a consonant becomes anusvāra)
• dus + carati → duścarati
  (ścutva: s → ś before c)

These follow the consonant sandhi rules described in the results, such as ścutva and jastva

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.

3. Visarga sandhi with indeclinables

Indeclinables ending in visarga (e.g., nis, dus, vis) undergo visarga sandhi:

• nis + śaṅka → niśśaṅka
  (visarga becomes ś before ś, as shown in visarga sandhi examples

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Why grammarians name it separately

Although Pāṇini does not list anvyakṣara sandhi as an independent category, later pedagogical traditions use the term to emphasize:

• the frequency of sandhi after indeclinables
• the predictability of changes based on the final letter of the avyaya
• the importance of recognizing upasarga + dhātu combinations in verb formation
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Summary

• Anvyakṣara sandhi = sandhi occurring when an indeclinable (avyaya) joins with the next word.
• It is not a separate sandhi type but a context in which standard sandhi rules apply.
• It uses the same mechanisms described in the results: vowel, consonant, and visarga sandhi

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• Common with upasargas (pra, sam, nis, dus, su, etc.) and indeclinables (api, atha, iti, etc.).
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  2 Sources