महाभारतः mahābhārataḥ - book-12, chapter-272, verse-18

ततोऽन्तरिक्षमावृत्य वृत्रो धर्मभृतां वरः ।
अश्मवर्षेण देवेन्द्रं पर्वतात्समवाकिरत् ॥१८॥

18. tato'ntarikṣamāvṛtya vṛtro dharmabhṛtāṁ varaḥ ,
aśmavarṣeṇa devendraṁ parvatātsamavākirat.

18. tataḥ antarikṣam āvṛtya vṛtraḥ dharmabhṛtām
varaḥ aśmavarṣeṇa devendram parvatāt samavākirat

18. tataḥ dharmabhṛtām varaḥ vṛtraḥ antarikṣam āvṛtya
parvatāt aśmavarṣeṇa devendram samavākirat

18. Then, Vritra, who was the best among those who uphold natural law (dharma), having enveloped the sky, showered Devendra (Indra) with a rain of stones from a mountain.

Words meanings summery:

• ततः (tataḥ) - then (then, thereupon, from that)

• अन्तरिक्षम् (antarikṣam) - the sky (sky, atmosphere, intermediate space)

• आवृत्य (āvṛtya) - having enveloped (having covered, having enveloped)

• वृत्रः (vṛtraḥ) - Vritra (Vritra (name of a demon))

• धर्मभृताम् (dharmabhṛtām) - of those who uphold natural law (dharma) (of those who uphold natural law (dharma), of righteous ones)

• वरः (varaḥ) - the best (best, foremost, excellent)

• अश्मवर्षेण (aśmavarṣeṇa) - with a rain of stones (with a shower of stones, by a rain of stones)

• देवेन्द्रम् (devendram) - Devendra (Indra) (Indra, the lord of the gods)

• पर्वतात् (parvatāt) - from a mountain (from the mountain)

• समवाकिरत् (samavākirat) - he showered (he showered, he scattered, he poured upon)

Words meanings and morphology

ततः (tataḥ) - then (then, thereupon, from that)

(indeclinable)

अन्तरिक्षम् (antarikṣam) - the sky (sky, atmosphere, intermediate space)

(noun)

Accusative, neuter, singular of antarikṣa

antarikṣa - atmosphere, sky, mid-region, space between heaven and earth

आवृत्य (āvṛtya) - having enveloped (having covered, having enveloped)

(indeclinable)

Absolutive (Gerund)

From root vṛ with prefix ā. Absolutive suffix 'tya' used for roots with prefixes.

Prefix: ā

Root: vṛ (class 5)

वृत्रः (vṛtraḥ) - Vritra (Vritra (name of a demon))

(proper noun)

Nominative, masculine, singular of vṛtra

vṛtra - Vritra (a formidable serpent or dragon-like Asura in Vedic Hinduism, personification of drought and adversary of Indra)

Root: vṛ (class 5)

धर्मभृताम् (dharmabhṛtām) - of those who uphold natural law (dharma) (of those who uphold natural law (dharma), of righteous ones)

(adjective)

Genitive, masculine, plural of dharmabhṛt

dharmabhṛt - upholder of natural law, righteous, virtuous

Compound of 'dharma' and 'bhṛt' (from root bhṛ - to bear, uphold)

Compound type : tatpuruṣa (dharma+bhṛt)

• dharma – natural law, constitution, duty, righteousness, virtue, custom
  noun (masculine)
  From root dhṛ (to hold, support, maintain)
  Root: dhṛ (class 1)
• bhṛt – bearing, upholding, maintaining, supporting
  adjective
  suffix -kvip
  From root bhṛ (to bear, uphold)
  Root: bhṛ (class 1)

Note: Used substantively here, 'of the upholders of dharma'.

वरः (varaḥ) - the best (best, foremost, excellent)

(adjective)

Nominative, masculine, singular of vara

vara - best, excellent, superior; boon, blessing; a choice

From root vṛ (to choose)

Root: vṛ (class 5)

Note: It agrees with Vṛtraḥ.

अश्मवर्षेण (aśmavarṣeṇa) - with a rain of stones (with a shower of stones, by a rain of stones)

(noun)

Instrumental, neuter, singular of aśmavarṣa

aśmavarṣa - shower of stones, hail of stones

Compound of 'aśman' (stone) and 'varṣa' (rain, showering)

Compound type : tatpuruṣa (aśman+varṣa)

• aśman – stone, rock, thunderbolt
  noun (masculine)
• varṣa – rain, showering, year
  noun (neuter)
  From root vṛṣ (to rain)
  Root: vṛṣ (class 1)

Note: The 'ṇa' is due to 'r' in 'varṣa' (retroflexion).

देवेन्द्रम् (devendram) - Devendra (Indra) (Indra, the lord of the gods)

(proper noun)

Accusative, masculine, singular of devendra

devendra - Indra, chief of the gods

Compound of 'deva' (god) and 'indra' (Indra)

Compound type : tatpuruṣa (deva+indra)

• deva – god, deity, divine
  noun (masculine)
  Root: div (class 4)
• indra – Indra (name of the chief Vedic deity)
  proper noun (masculine)

पर्वतात् (parvatāt) - from a mountain (from the mountain)

(noun)

Ablative, masculine, singular of parvata

parvata - mountain, hill, rock

समवाकिरत् (samavākirat) - he showered (he showered, he scattered, he poured upon)

(verb)

3rd person , singular, active, past imperfect (laṅ) of samavakir

Imperfect

From root kṛ with prefixes sam- and ava-. 3rd person singular Imperfect (laṅ) with augment 'a'.

Prefixes: sam+ava

Root: kṛ (class 6)

Note: Root `kṛ` (to scatter) with prefixes `sam-ava-`. `samavākirat` is 3rd sing. Imperfect.