महाभारतः mahābhārataḥ - book-7, chapter-111, verse-29

तौ रथाभ्यां महाराज मण्डलावर्तनादिषु ।
व्यरोचेतां महात्मानौ वृत्रवज्रधराविव ॥२९॥

29. tau rathābhyāṁ mahārāja maṇḍalāvartanādiṣu ,
vyarocetāṁ mahātmānau vṛtravajradharāviva.

29. tau rathābhyām mahārāja maṇḍalāvartana-ādiṣu
vyaroce-tām mahātmānau vṛtra-vajradharau iva

29. mahārāja tau mahātmānau rathābhyām
maṇḍalāvartana-ādiṣu vṛtra-vajradharau iva vyarocetām

29. O great king, those two great souls shone with their chariots during circular maneuvers and the like, just like Vṛtra and Indra, the wielder of the thunderbolt (vajra).

Words meanings summery:

• तौ (tau) - those two

• रथाभ्याम् (rathābhyām) - with two chariots

• महाराज (mahārāja) - O great king

• मण्डलावर्तन-आदिषु (maṇḍalāvartana-ādiṣu) - in circular maneuvers and the like

• व्यरोचे-ताम् (vyaroce-tām) - they both shone, they both appeared splendid

• महात्मानौ (mahātmānau) - two great souls, two noble persons

• वृत्र-वज्रधरौ (vṛtra-vajradharau) - Vṛtra and the wielder of the thunderbolt (Indra)

• इव (iva) - like, as, as if

Words meanings and morphology

तौ (tau) - those two

(pronoun)

Nominative, masculine, dual of tad

tad - that, those

रथाभ्याम् (rathābhyām) - with two chariots

(noun)

Instrumental, masculine, dual of ratha

ratha - chariot, car, vehicle

महाराज (mahārāja) - O great king

(noun)

Vocative, masculine, singular of mahārāja

mahārāja - great king

Compound type : karmadhāraya (mahā+rājan)

• mahā – great, large, mighty
  adjective (feminine)
• rājan – king, ruler
  noun (masculine)

मण्डलावर्तन-आदिषु (maṇḍalāvartana-ādiṣu) - in circular maneuvers and the like

(noun)

Locative, masculine, plural of maṇḍalāvartanādi

maṇḍalāvartanādi - circular maneuvers etc.

Compound type : dvandva (maṇḍalāvartana+ādi)

• maṇḍalāvartana – circular movement, wheeling around
  noun (neuter)
• ādi – beginning, and so on, etc.
  noun (masculine)

व्यरोचे-ताम् (vyaroce-tām) - they both shone, they both appeared splendid

(verb)

3rd person , dual, active, imperfect (laṅ) of viruc

Prefix: vi

Root: ruc (class 1)

महात्मानौ (mahātmānau) - two great souls, two noble persons

(noun)

Nominative, masculine, dual of mahātman

mahātman - great soul, noble person, supreme spirit (ātman)

Compound type : karmadhāraya (mahā+ātman)

• mahā – great, large, mighty
  adjective (feminine)
• ātman – self, soul, spirit, essence (ātman)
  noun (masculine)

वृत्र-वज्रधरौ (vṛtra-vajradharau) - Vṛtra and the wielder of the thunderbolt (Indra)

(noun)

Nominative, masculine, dual of vṛtravajradhara

vṛtravajradhara - Vṛtra and the wielder of the thunderbolt

Compound type : dvandva (vṛtra+vajradhara)

• vṛtra – Vṛtra (name of an Asura slain by Indra)
  proper noun (masculine)
• vajradhara – wielder of the thunderbolt (vajra), an epithet of Indra
  noun (masculine)

इव (iva) - like, as, as if

(indeclinable)