महाभारतः mahābhārataḥ - book-1, chapter-57, verse-76

तथा भीष्मः शांतनवो गङ्गायाममितद्युतिः ।
वसुवीर्यात्समभवन्महावीर्यो महायशाः ॥७६॥

76. tathā bhīṣmaḥ śāṁtanavo gaṅgāyāmamitadyutiḥ ,
vasuvīryātsamabhavanmahāvīryo mahāyaśāḥ.

76. tathā bhīṣmaḥ śāntanavaḥ gaṅgāyām amitadyutiḥ
vasuvīryāt samabhavan mahāvīryaḥ mahāyaśāḥ

76. Thus, Bhīṣma, the son of Śāntanu, of immeasurable splendor, was born from the virility of the Vasus, possessing great prowess and great fame.

Words meanings summery:

• तथा (tathā) - thus, in this manner (thus, so, in that manner)

• भीष्मः (bhīṣmaḥ) - Bhīṣma (the Kuru warrior) (Bhīṣma (proper name))

• शान्तनवः (śāntanavaḥ) - the son of Śāntanu (son of Śāntanu, belonging to Śāntanu)

• गङ्गायाम् (gaṅgāyām) - from Gaṅgā (as the mother) (in the Gaṅgā, from the Gaṅgā)

• अमितद्युतिः (amitadyutiḥ) - of immeasurable splendor (of immeasurable splendor/lustre)

• वसुवीर्यात् (vasuvīryāt) - from the virility/seed of the Vasus (from the energy/semen of the Vasus, from the seed of a Vasu)

• समभवन् (samabhavan) - was born (referring to Bhīṣma, despite plural form, possibly an archaic usage or textual variant for singular `samabhavat`, or implicitly refers to the Vasus' collective manifestation) (they were born, they came into being)

• महावीर्यः (mahāvīryaḥ) - possessing great prowess (of great prowess, very powerful)

• महायशाः (mahāyaśāḥ) - of great fame (of great fame, very famous)

Words meanings and morphology

तथा (tathā) - thus, in this manner (thus, so, in that manner)

(indeclinable)

भीष्मः (bhīṣmaḥ) - Bhīṣma (the Kuru warrior) (Bhīṣma (proper name))

(noun)

Nominative, masculine, singular of bhīṣma

bhīṣma - terrible, formidable; proper name of the son of Śāntanu and Gaṅgā

Root: bhīṣ (class 1)

शान्तनवः (śāntanavaḥ) - the son of Śāntanu (son of Śāntanu, belonging to Śāntanu)

(adjective)

Nominative, masculine, singular of śāntanava

śāntanava - descendant of Śāntanu, son of Śāntanu

patronymic from Śāntanu

गङ्गायाम् (gaṅgāyām) - from Gaṅgā (as the mother) (in the Gaṅgā, from the Gaṅgā)

(noun)

Locative, feminine, singular of gaṅgā

gaṅgā - the river Ganges; proper name of the goddess Gaṅgā

Note: Locative case used to indicate origin (born from Gaṅgā).

अमितद्युतिः (amitadyutiḥ) - of immeasurable splendor (of immeasurable splendor/lustre)

(adjective)

Nominative, masculine, singular of amitadyuti

amitadyuti - of immeasurable splendor, infinitely bright

Compound type : bahuvrīhi (amita+dyuti)

• amita – unmeasured, immeasurable, infinite
  adjective (masculine)
  past passive participle (negated)
  Prefix: a
  Root: mā (class 3)
• dyuti – light, splendor, lustre, gleam
  noun (feminine)
  action noun
  Root: dyut (class 1)

वसुवीर्यात् (vasuvīryāt) - from the virility/seed of the Vasus (from the energy/semen of the Vasus, from the seed of a Vasu)

(noun)

Ablative, neuter, singular of vasuvīrya

vasuvīrya - energy/virility of the Vasus

Compound type : genitive tatpuruṣa (vasu+vīrya)

• vasu – a class of deities, wealth, good
  noun (masculine)
• vīrya – virility, energy, prowess, heroism, seed
  noun (neuter)

समभवन् (samabhavan) - was born (referring to Bhīṣma, despite plural form, possibly an archaic usage or textual variant for singular `samabhavat`, or implicitly refers to the Vasus' collective manifestation) (they were born, they came into being)

(verb)

3rd person , plural, active, past imperfect (laṅ) of sam-bhū

Prefix: sam

Root: bhū (class 1)

Note: Though verb form is plural (they were born), context with singular subjects (Bhīṣma, etc.) strongly suggests an interpretation as singular, possibly archaic usage, textual variant for `samabhavat`, or referring to the collective group of Vasus from whom Bhīṣma originated.

महावीर्यः (mahāvīryaḥ) - possessing great prowess (of great prowess, very powerful)

(adjective)

Nominative, masculine, singular of mahāvīrya

mahāvīrya - of great prowess, very powerful, mighty

Compound type : bahuvrīhi (mahā+vīrya)

• mahā – great, mighty
  adjective (feminine)
• vīrya – virility, energy, prowess, heroism
  noun (neuter)

महायशाः (mahāyaśāḥ) - of great fame (of great fame, very famous)

(adjective)

Nominative, masculine, singular of mahāyaśas

mahāyaśas - of great fame, very renowned

Compound type : bahuvrīhi (mahā+yaśas)

• mahā – great, mighty
  adjective (feminine)
• yaśas – fame, glory, renown
  noun (neuter)