sautra dhatus
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संस्कृत संवादः
To understand सौत्र (sautra) roots, let us first quickly contextualize the three major classifications of roots in Sanskrit grammar:
औपदेशिक धातु (aupadeśika dhātu - originally taught roots): These are the 1,900+ standard verbal roots explicitly listed in Pāṇini's धातुपाठ (Dhātupāṭha - the traditional catalog of verbal roots).
आतिदेशिक धातु (ātideśika dhātu - extended or derived roots): These are secondary roots formed by adding grammatical affixes to existing roots or nouns, such as in the creation of सनाद्यन्त (sanādyanta - desideratives, frequentatives, and causatives).
सौत्र धातु (sautra dhātu - rule-embedded roots): These are unique verbal roots that are not found in the standard Dhātupāṭha. Instead, they are directly stated or inferred within the सूत्रपाठ (Sūtrapāṭha - the text of grammatical rules) of the Aṣṭādhyāyī to justify the derivation of specific, irregular, or archaic words.
उपमा (Upamā - Analogy):
Think of the Dhātupāṭha as the "public menu" of a restaurant, which lists all the regular items (the औपदेशिक roots). The rules for customizing those dishes (like adding extra spices) represent the आतिदेशिक roots. A सौत्र (sautra) root, however, is a "secret menu item." It is not listed on the public menu at all, but the chef's internal recipe book (the Aṣṭādhyāyī) explicitly mentions it to allow the creation of very specific, highly traditional dishes known only to the connoisseurs.
Here are the most prominent examples of सौत्र धातु (sautra dhātu) used by Pāṇini, along with their rules and resulting words:
1. जु (ju - to move quickly)Pāṇini uses this root to derive the word जवनः (javanaḥ - a courser or a swift horse).
Sūtra: जुचङ्क्रम्यदन्द्रम्यसृगृधिज्वलशुचलषपतपदः ॥ [Pāṇini, Aṣṭādhyāyī, 3.2.150]
Padaccheda: जु-चङ्क्रम्य-दन्द्रम्य-सृ-गृधि-ज्वल-शुच-लष-पत-पदः ।
Explanation: This rule prescribes the affix युच् (yuc) to a specific list of roots to indicate an agent who has a habit of performing the action. Because the root जु (ju) is absent from the Dhātupāṭha, commentators explicitly classify it as a sautra root.
Pāṇini uses this root to derive the unique present-tense verb ऋतीयते (ṛtīyate - he hates).
Sūtra: ऋतेरीयङ् ॥ [Pāṇini, Aṣṭādhyāyī, 3.1.29]
Padaccheda: ऋतेः ईयङ् ।
Explanation: This rule attaches the affix ईयङ् (īyaṅ) to the root ऋत् (ṛt) in its own sense (स्वार्थे - svārthe). The Kāśikā Vṛtti explicitly defines its status: "ऋतिः सौत्रो धातुर्घृणायां वर्त्तते" (ṛtiḥ sautro dhāturghṛṇāyāṃ varttate - 'ṛti' is a sautra root used in the sense of hatred). [Vāmana and Jayāditya, Kāśikā Vṛtti, on P. 3.1.29]
These roots are used to derive Vedic and classical verbal forms like स्तभ्नोति (stabhnoti - he supports) or स्कभ्नाति (skabhnāti - he hinders).
Sūtra: स्तम्भुस्तुम्भुस्कम्भुस्कुम्भुस्कुञ्भ्यः श्नुश्च ॥ [Pāṇini, Aṣṭādhyāyī, 3.1.82]
Padaccheda: स्तम्भु-स्तुम्भु-स्कम्भु-स्कुम्भु-स्कुञ्भ्यः श्नुः च ।
Explanation: This rule dictates that these specific roots optionally take the श्नु (śnu) or श्ना (śnā) विकरण (vikaraṇa - conjugational class sign). While the fifth root mentioned in the sutra, स्कुञ् (skuñ), is found in the regular Dhātupāṭha, the first four (स्तम्भ्, स्तुम्भ्, स्कम्भ्, स्कुम्भ्) are not, and are therefore classified as sautra roots.
Pāṇini uses this root to justify Vedic verbal forms like उत्तौति (ut-tauti) or उत्तवीति (ut-tavīti).
Sūtra: तुरुस्तुशम्यमः सार्वधातुके ॥ [Pāṇini, Aṣṭādhyāyī, 7.3.95]
Padaccheda: तु-रु-स्तु-शम्-यमः सार्वधातुके ।
Explanation: This rule allows the optional insertion of the augment ईट् (īṭ) before a consonant-beginning सार्वधातुक (sārvadhātuka - a primary verbal affix). Since the root तु (tu) is only introduced here and is missing from the primary list, it is treated as a sautra root.
विभिन्न-दृष्टिकोण (Vibhinna-dṛṣṭikoṇa - Multiple Points of View):
The existence of these "out-of-list" roots has led to different interpretations among grammarians:
According to the strict Pāṇinian School: Pāṇini intentionally kept these roots out of the Dhātupāṭha because their usage is highly restricted (often limited to a single specific noun or isolated Vedic verb). Placing them directly into the Sūtrapāṭha was mathematically and pedagogically more economical (लाघव - lāghava).
According to Historical Grammarians (like Nāgeśa Bhaṭṭa): Before Pāṇini, there were much larger, older root-lists compiled by predecessors such as आपिशलि (Āpiśali). Pāṇini rigorously streamlined his Dhātupāṭha. However, to account for certain archaic, Vedic, or dialectal words that still existed in the language, he borrowed those roots directly from older treatises and embedded them in his rules, thereby preserving them as सौत्र (sautra) roots. [Nāgeśa Bhaṭṭa, Uddyota on Mahābhāṣya].