Uṇādi Suffix i (इ) — The Agent Maker
1. The Uṇādi i (इ) Suffix Rule
The Uṇādi Sūtras are a collection of ancient Sanskrit grammatical rules used to derive nouns directly from verbal roots (धातु) — nouns that cannot be easily explained by Pāṇini's primary rules alone.
One of the most fundamental of these is the short vowel suffix इ (i). It is attached to a root to create a noun that identifies the entity that performs the action of the root.
This makes it an Agent Maker — the Sanskrit equivalent of the English "-er" suffix:
- "to teach" + -er = teacher (the one who teaches)
- "to swallow" + इ = the one who swallows
2. The Role of the ṝ -> ir Transformation
When this suffix is attached to roots containing the vocalic ṝ (ṝ) — a heavy, rolled vowel — a specific Pāṇinian phonological rule applies.
The rule, known as ur aṇ raparaḥ, governs how this heavy vowel behaves when manipulated during suffix attachment. The ṝ does not simply merge with इ; it transforms into the syllable इर् (ir):
ṝ -> इर् (ir)
This keeps the phonetic weight of the original sound while making it pronounceable in the derived noun. The resulting formation is then naturally short and clean:
ग + इर् + इ = गिरि
3. Comparison with Hindi
Hindi has inherited many Uṇādi-i nouns as direct Tatsama borrowings. You encounter them constantly without realising their verbal origins:
| Word | Root | Original Agent Meaning |
|---|---|---|
| गिरि (Giri) | √गॄ (gṝ) — to swallow | "The Swallower" — a mountain |
| कवि (Kavi) | √कु (ku) — to sound / to describe | "The Describer" — a poet |
| रवि (Ravi) | √रु (ru) — to roar / to radiate | "The Radiator" — the sun |
4. Examples from the Manas
- गिरि: From the root गॄ (gṝ — to swallow) + इ (i). "The Great Swallower" — a mountain, named for the way it absorbs clouds and devours the sky.