महाभारतः mahābhārataḥ - book-1, chapter-216, verse-21

वज्रनाभं ततश्चक्रं ददौ कृष्णाय पावकः ।
आग्नेयमस्त्रं दयितं स च कल्योऽभवत्तदा ॥२१॥

21. vajranābhaṁ tataścakraṁ dadau kṛṣṇāya pāvakaḥ ,
āgneyamastraṁ dayitaṁ sa ca kalyo'bhavattadā.

21. vajranābham tataḥ cakram dadau kr̥ṣṇāya pāvakaḥ
āgneyam astram dayitam sa ca kalyaḥ abhavat tadā

21. Then Agni (Pāvaka) gave Krishna (Kr̥ṣṇa) the discus (cakra) with a thunderbolt hub, a beloved fiery weapon (āgneya astra). And then he (Arjuna) also became capable and ready.

Words meanings summery:

• वज्रनाभम् (vajranābham) - (discus) with a thunderbolt-like hub (thunderbolt-hubbed, having a hub like a thunderbolt)

• ततः (tataḥ) - then (then, from there, afterwards)

• चक्रम् (cakram) - discus (discus, wheel)

• ददौ (dadau) - gave

• क्र्̥ष्णाय (kr̥ṣṇāya) - to Krishna (Kr̥ṣṇa) (to Krishna)

• पावकः (pāvakaḥ) - Agni, the Fire-god (purifier, fire, Agni)

• आग्नेयम् (āgneyam) - fiery, belonging to Agni

• अस्त्रम् (astram) - weapon (weapon, missile)

• दयितम् (dayitam) - beloved (beloved, dear)

• स (sa) - he (Arjuna) (he, that)

• च (ca) - and, also

• कल्यः (kalyaḥ) - capable, ready (capable, healthy, ready)

• अभवत् (abhavat) - became (became, was)

• तदा (tadā) - then (then, at that time)

Words meanings and morphology

वज्रनाभम् (vajranābham) - (discus) with a thunderbolt-like hub (thunderbolt-hubbed, having a hub like a thunderbolt)

(adjective)

Accusative, neuter, singular of vajranābha

vajranābha - having a nave like a thunderbolt, thunderbolt-hubbed

Compound type : bahuvrīhi (vajra+nābhi)

• vajra – thunderbolt, diamond
  noun (masculine/neuter)
• nābhi – navel, hub, center
  noun (masculine/feminine)

ततः (tataḥ) - then (then, from there, afterwards)

(indeclinable)

Root: tad

चक्रम् (cakram) - discus (discus, wheel)

(noun)

Accusative, neuter, singular of cakra

cakra - wheel, discus, circle, army division

Root: car (class 1)

ददौ (dadau) - gave

(verb)

3rd person , singular, active, perfect (Lit) of dā

Perfect active

Reduplicated perfect form of dā.

Root: dā (class 3)

क्र्̥ष्णाय (kr̥ṣṇāya) - to Krishna (Kr̥ṣṇa) (to Krishna)

(proper noun)

Dative, masculine, singular of kr̥ṣṇa

kr̥ṣṇa - Krishna, black, dark, dark-blue

Root: kṛṣ (class 1)

पावकः (pāvakaḥ) - Agni, the Fire-god (purifier, fire, Agni)

(proper noun)

Nominative, masculine, singular of pāvaka

pāvaka - purifying, pure, fire, Agni

Agent Noun

From root pū (to purify) + -aka.

Root: pū (class 1)

आग्नेयम् (āgneyam) - fiery, belonging to Agni

(adjective)

Accusative, neuter, singular of āgneya

āgneya - fiery, relating to Agni, presided over by Agni

From Agni with suffix eya.

अस्त्रम् (astram) - weapon (weapon, missile)

(noun)

Accusative, neuter, singular of astra

astra - missile, weapon (discharged by mantra)

From root as (to throw) + tra.

Root: as (class 4)

दयितम् (dayitam) - beloved (beloved, dear)

(adjective)

Accusative, neuter, singular of dayita

dayita - beloved, dear, desired

Past Passive Participle

From root day (to love, cherish) + -ita.

Root: day (class 1)

स (sa) - he (Arjuna) (he, that)

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

च (ca) - and, also

(indeclinable)

कल्यः (kalyaḥ) - capable, ready (capable, healthy, ready)

(adjective)

Nominative, masculine, singular of kalya

kalya - healthy, strong, able, fit, auspicious, ready, clever

Root: kal (class 10)

अभवत् (abhavat) - became (became, was)

(verb)

3rd person , singular, active, imperfect (Laṅ) of bhū

Imperfect active

With augment a- and third person singular ending.

Root: bhū (class 1)

तदा (tadā) - then (then, at that time)

(indeclinable)

Formed from pronominal base tad.