महाभारतः mahābhārataḥ - book-5, chapter-136, verse-7

दानवान्घोरकर्माणो निवातकवचान्युधि ।
रौद्रमस्त्रं समाधाय दग्धवानस्त्रवह्निना ॥७॥

7. dānavānghorakarmāṇo nivātakavacānyudhi ,
raudramastraṁ samādhāya dagdhavānastravahninā.

7. dānavān ghorakarmāṇaḥ nivātakavacān yudhi
raudram astram samādhāya dagdhavān astravahninā

7. raudram astram samādhāya ghorakarmāṇaḥ
nivātakavacān dānavān yudhi astravahninā dagdhavān

7. Having fixed a formidable weapon, he incinerated the Nivātakavaca demons, who engaged in terrible deeds, in battle with the fire of that weapon.

Words meanings summery:

• दानवान् (dānavān) - demons, sons of Danu

• घोरकर्माणः (ghorakarmāṇaḥ) - those of terrible deeds, dreadful agents

• निवातकवचान् (nivātakavacān) - Nivātakavacas (a class of demons)

• युधि (yudhi) - in battle, in combat

• रौद्रम् (raudram) - fierce, terrible, formidable, wrathful

• अस्त्रम् (astram) - weapon, missile

• समाधाय (samādhāya) - having fixed, having aimed, having concentrated, having invoked

• दग्धवान् (dagdhavān) - he burnt, he incinerated

• अस्त्रवह्निना (astravahninā) - by the fire of the weapon

Words meanings and morphology

दानवान् (dānavān) - demons, sons of Danu

(noun)

Accusative, masculine, plural of dānava

dānava - a demon, a son of Danu

from Danu, suffix -a

घोरकर्माणः (ghorakarmāṇaḥ) - those of terrible deeds, dreadful agents

(adjective)

Accusative, masculine, plural of ghorakarman

ghorakarman - one whose deeds are terrible, performing dreadful actions

Compound type : bahuvrihi (ghora+karman)

• ghora – terrible, dreadful, formidable
  adjective (neuter)
• karman – deed, action, work (karma)
  noun (neuter)
  from root kṛ 'to do'
  Root: kṛ (class 8)

Note: Qualifies 'dānavān' and 'nivātakavacān'.

निवातकवचान् (nivātakavacān) - Nivātakavacas (a class of demons)

(proper noun)

Accusative, masculine, plural of nivātakavaca

nivātakavaca - a class of powerful demons, clad in impenetrable armor, impervious to missiles

Compound type : bahuvrihi (nivāta+kavaca)

• nivāta – protected from wind, windless
  adjective (neuter)
  Prefix: ni
• kavaca – armor, breastplate
  noun (masculine)

युधि (yudhi) - in battle, in combat

(noun)

Locative, feminine, singular of yudh

yudh - battle, fight, war

रौद्रम् (raudram) - fierce, terrible, formidable, wrathful

(adjective)

Accusative, neuter, singular of raudra

raudra - fierce, terrible, formidable, belonging to Rudra

from Rudra

Note: Qualifies 'astram'.

अस्त्रम् (astram) - weapon, missile

(noun)

Accusative, neuter, singular of astra

astra - a missile, an arrow, a weapon (especially one discharged by spells)

from root as 'to throw'

Root: as (class 4)

समाधाय (samādhāya) - having fixed, having aimed, having concentrated, having invoked

(indeclinable)

absolutive/gerund

from root dhā with upasargas sam-ā

Prefixes: sam+ā

Root: dhā (class 3)

दग्धवान् (dagdhavān) - he burnt, he incinerated

(participle)

Nominative, masculine, singular of dagdhavant

dagdhavant - one who has burnt

Past Active Participle

from root dah, suffix -vat

Root: dah (class 1)

Note: Implies the subject, often Arjuna in such contexts.

अस्त्रवह्निना (astravahninā) - by the fire of the weapon

(noun)

Instrumental, masculine, singular of astravahni

astravahni - the fire of a weapon

Compound type : tatpurusha (astra+vahni)

• astra – weapon, missile
  noun (neuter)
  Root: as (class 4)
• vahni – fire, Agni
  noun (masculine)
  from root vah 'to carry'
  Root: vah (class 1)