महाभारतः mahābhārataḥ - book-7, chapter-9, verse-13

यदायाज्जलदप्रख्यो रथः परमवीर्यवान् ।
पर्जन्य इव बीभत्सुस्तुमुलामशनिं सृजन् ॥१३॥

13. yadāyājjaladaprakhyo rathaḥ paramavīryavān ,
parjanya iva bībhatsustumulāmaśaniṁ sṛjan.

13. yadā āyāt jalada-prākhyaḥ rathaḥ parama-vīryavān
parjanyaḥ iva bībhatsuḥ tumulām aśanim sṛjan

13. yadā jalada-prākhyaḥ parama-vīryavān rathaḥ āyāt,
[tadā] bībhatsuḥ parjanyaḥ iva tumulām aśanim sṛjan [āyāt]

13. When his exceedingly powerful chariot, resembling a cloud, advanced—Arjuna (Bibhatsu), like the rain-god (Parjanya), unleashed a mighty thunderbolt...

Words meanings summery:

• यदा (yadā) - when

• आयात् (āyāt) - came, approached

• जलद-प्राख्यः (jalada-prākhyaḥ) - resembling a cloud, cloud-like

• रथः (rathaḥ) - chariot

• परम-वीर्यवान् (parama-vīryavān) - exceedingly powerful, very mighty

• पर्जन्यः (parjanyaḥ) - rain-god, cloud

• इव (iva) - like, as

• बीभत्सुः (bībhatsuḥ) - Bibhatsu (Arjuna's epithet)

• तुमुलाम् (tumulām) - tumultuous, terrible, mighty

• अशनिम् (aśanim) - thunderbolt, weapon

• सृजन् (sṛjan) - creating, unleashing, discharging

Words meanings and morphology

यदा (yadā) - when

(indeclinable)

आयात् (āyāt) - came, approached

(verb)

3rd person , singular, active, past imperfect (laṅ) of ā-yā

Prefix: ā

Root: yā (class 2)

जलद-प्राख्यः (jalada-prākhyaḥ) - resembling a cloud, cloud-like

(adjective)

Nominative, masculine, singular of jalada-prākhya

jalada-prākhya - resembling a cloud, cloud-like in appearance

Compound type : tatpuruṣa (jalada+prākhya)

• jalada – cloud (giver of water)
  noun (masculine)
  Compound of jala (water) and da (giver, from root dā)
• prākhya – resembling, appearing as
  adjective
  From pra-ākhyā (to tell, resemble)

रथः (rathaḥ) - chariot

(noun)

Nominative, masculine, singular of ratha

ratha - chariot, car

परम-वीर्यवान् (parama-vīryavān) - exceedingly powerful, very mighty

(adjective)

Nominative, masculine, singular of parama-vīryavat

parama-vīryavat - exceedingly powerful, possessing supreme valor

Compound type : tatpuruṣa (parama+vīryavat)

• parama – supreme, highest, excellent
  adjective
• vīryavat – powerful, brave, valorous
  adjective (masculine)
  Derived from vīrya (valor) with possessive suffix matup

पर्जन्यः (parjanyaḥ) - rain-god, cloud

(noun)

Nominative, masculine, singular of parjanya

parjanya - rain-god, cloud, rain

इव (iva) - like, as

(indeclinable)

बीभत्सुः (bībhatsuḥ) - Bibhatsu (Arjuna's epithet)

(proper noun)

Nominative, masculine, singular of bībhatsu

bībhatsu - Bibhatsu (epithet of Arjuna, meaning 'one who abhors/detests war or foul play')

Intensive form of root bhī (to fear)

Root: bhī (class 3)

तुमुलाम् (tumulām) - tumultuous, terrible, mighty

(adjective)

Accusative, feminine, singular of tumula

tumula - tumultuous, noisy, terrible, mighty

अशनिम् (aśanim) - thunderbolt, weapon

(noun)

Accusative, feminine, singular of aśani

aśani - thunderbolt, lightning, missile, weapon

सृजन् (sṛjan) - creating, unleashing, discharging

(adjective)

Nominative, masculine, singular of sṛjat

sṛj - to create, emit, cast, discharge

Present Active Participle

From root sṛj (to create, emit) with śatṛ (present active participle) suffix

Root: sṛj (class 6)