महाभारतः mahābhārataḥ - book-3, chapter-37, verse-29

ऋषिरेष महातेजा नारायणसहायवान् ।
पुराणः शाश्वतो देवो विष्णोरंशः सनातनः ॥२९॥

29. ṛṣireṣa mahātejā nārāyaṇasahāyavān ,
purāṇaḥ śāśvato devo viṣṇoraṁśaḥ sanātanaḥ.

29. ṛṣiḥ eṣaḥ mahātejāḥ Nārāyaṇa-sahāyavān
purāṇaḥ śāśvataḥ devaḥ Viṣṇoḥ aṃśaḥ sanātanaḥ

29. This highly effulgent sage (ṛṣi) has Nārāyaṇa as his helper. He is ancient, eternal, a divine being, and an everlasting portion (aṃśa) of Viṣṇu.

Words meanings summery:

• ऋषिः (ṛṣiḥ) - a sage, an ascetic, an inspired poet

• एषः (eṣaḥ) - this (masculine singular nominative)

• महातेजाः (mahātejāḥ) - having great splendor, highly effulgent

• नारायण-सहायवान् (nārāyaṇa-sahāyavān) - having Nārāyaṇa as a helper/companion, accompanied by Nārāyaṇa

• पुराणः (purāṇaḥ) - ancient, old, traditional

• शाश्वतः (śāśvataḥ) - eternal, perpetual, permanent

• देवः (devaḥ) - a god, a deity, divine being

• विष्णोः (viṣṇoḥ) - of Viṣṇu

• अंशः (aṁśaḥ) - a part, portion, share

• सनातनः (sanātanaḥ) - everlasting, eternal, perpetual

Words meanings and morphology

ऋषिः (ṛṣiḥ) - a sage, an ascetic, an inspired poet

(noun)

Nominative, masculine, singular of ṛṣi

ṛṣi - sage, ascetic, inspired poet, seer

Primary noun, often connected to the root ṛṣ 'to go' or dṛś 'to see'.

एषः (eṣaḥ) - this (masculine singular nominative)

(pronoun)

Nominative, masculine, singular of eṣa

eṣa - this (referring to something near the speaker)

Demonstrative pronoun, masculine nominative singular.

महातेजाः (mahātejāḥ) - having great splendor, highly effulgent

(adjective)

Nominative, masculine, singular of mahātejas

mahātejas - of great brilliance, highly effulgent, powerful

Bahuvrīhi compound, meaning 'one whose brilliance is great'.

Compound type : bahuvrihi (mahā+tejas)

• mahā – great, large, mighty
  adjective
• tejas – brilliance, splendor, energy, spiritual power
  noun (neuter)
  From root tij 'to be sharp'.
  Root: tij (class 6)

नारायण-सहायवान् (nārāyaṇa-sahāyavān) - having Nārāyaṇa as a helper/companion, accompanied by Nārāyaṇa

(adjective)

Nominative, masculine, singular of Nārāyaṇa-sahāyavat

Nārāyaṇa-sahāyavat - having Nārāyaṇa as a helper, accompanied by Nārāyaṇa

Possessive suffix matUP (-vat/-mān)

Derived from the compound Nārāyaṇa-sahāya with the possessive suffix matUP, meaning 'possessing Nārāyaṇa as a helper'.

Compound type : tatpurusha (Nārāyaṇa+sahāya)

• Nārāyaṇa – Nārāyaṇa (name of Viṣṇu)
  proper noun (masculine)
• sahāya – helper, assistant, companion, support
  noun (masculine)
  From prefix sa- and root i 'to go'.
  Prefix: sa
  Root: i (class 2)

Note: The vān ending is the masculine nominative singular form of the vat/mat possessive suffix.

पुराणः (purāṇaḥ) - ancient, old, traditional

(adjective)

Nominative, masculine, singular of purāṇa

purāṇa - ancient, old, belonging to the past

From purā (formerly) with the ana suffix.

शाश्वतः (śāśvataḥ) - eternal, perpetual, permanent

(adjective)

Nominative, masculine, singular of śāśvata

śāśvata - eternal, perpetual, permanent, constant

From śaśvat (always) with the aṇ suffix.

देवः (devaḥ) - a god, a deity, divine being

(noun)

Nominative, masculine, singular of deva

deva - god, deity, divine, celestial

From root div 'to shine, play'.

Root: div (class 4)

विष्णोः (viṣṇoḥ) - of Viṣṇu

(proper noun)

Genitive, masculine, singular of Viṣṇu

Viṣṇu - Viṣṇu (name of a principal Hindu deity)

From root viṣ 'to pervade' with nu suffix.

Root: viṣ (class 3)

अंशः (aṁśaḥ) - a part, portion, share

(noun)

Nominative, masculine, singular of aṃśa

aṁśa - part, portion, share, division

From root aś 'to obtain' with sa suffix.

Root: aś (class 5)

सनातनः (sanātanaḥ) - everlasting, eternal, perpetual

(adjective)

Nominative, masculine, singular of sanātana

sanātana - everlasting, eternal, perpetual, ancient

From sanā (always) with tana suffix.