महाभारतः mahābhārataḥ - book-12, chapter-278, verse-20

स तु प्रविष्ट उशना कोष्ठं माहेश्वरं प्रभुः ।
व्यचरच्चापि तत्रासौ महात्मा भृगुनन्दनः ॥२०॥

20. sa tu praviṣṭa uśanā koṣṭhaṁ māheśvaraṁ prabhuḥ ,
vyacaraccāpi tatrāsau mahātmā bhṛgunandanaḥ.

20. saḥ tu praviṣṭaḥ uśanā koṣṭham māheśvaram prabhuḥ
vyacarat ca api tatra asau mahātmā bhṛgunandanaḥ

20. saḥ tu prabhuḥ mahātmā bhṛgunandanaḥ uśanā māheśvaram
koṣṭham praviṣṭaḥ tatra asau ca api vyacarat

20. But that powerful Uśanā, the great-souled one (mahātman), the son of Bhṛgu, having entered the interior chamber of Maheśvara, also wandered about within it.

Words meanings summery:

• सः (saḥ) - He (Uśanā) (he, that)

• तु (tu) - but (but, indeed, however)

• प्रविष्टः (praviṣṭaḥ) - having entered (entered, having entered)

• उशना (uśanā) - Uśanā (Śukra) (Uśanā (name of Śukra))

• कोष्ठम् (koṣṭham) - interior chamber (interior chamber, belly, stomach, cell)

• माहेश्वरम् (māheśvaram) - of Maheśvara (Śiva) (relating to Maheśvara (Śiva))

• प्रभुः (prabhuḥ) - powerful one, lord (lord, master, powerful, capable)

• व्यचरत् (vyacarat) - wandered about (wandered, moved about)

• च (ca) - and, also

• अपि (api) - also (also, even, too)

• तत्र (tatra) - there (within the chamber) (there, in that place)

• असौ (asau) - that one (Uśanā) (that one (masculine/feminine nominative singular or neuter nominative/accusative dual))

• महात्मा (mahātmā) - great-souled one (great-souled, noble, magnanimous)

• भृगुनन्दनः (bhṛgunandanaḥ) - son of Bhṛgu (Uśanā) (son of Bhṛgu)

Words meanings and morphology

सः (saḥ) - He (Uśanā) (he, that)

(pronoun)

Nominative, masculine, singular of tad

tad - that

तु (tu) - but (but, indeed, however)

(indeclinable)

प्रविष्टः (praviṣṭaḥ) - having entered (entered, having entered)

(adjective)

Nominative, masculine, singular of praviṣṭa

praviṣṭa - entered, having entered

Past Passive Participle

From pra- + viś (to enter), formed with -ta suffix

Prefix: pra

Root: viś (class 6)

उशना (uśanā) - Uśanā (Śukra) (Uśanā (name of Śukra))

(proper noun)

Nominative, masculine, singular of uśanas

uśanas - Uśanā, Śukra

कोष्ठम् (koṣṭham) - interior chamber (interior chamber, belly, stomach, cell)

(noun)

Accusative, neuter, singular of koṣṭha

koṣṭha - interior chamber, belly, stomach, cell

माहेश्वरम् (māheśvaram) - of Maheśvara (Śiva) (relating to Maheśvara (Śiva))

(adjective)

Accusative, neuter, singular of māheśvara

māheśvara - relating to Maheśvara, of Śiva

Formed with aṇ suffix from Maheśvara

प्रभुः (prabhuḥ) - powerful one, lord (lord, master, powerful, capable)

(noun)

Nominative, masculine, singular of prabhu

prabhu - lord, master, powerful, capable

Prefix: pra

Root: bhū (class 1)

व्यचरत् (vyacarat) - wandered about (wandered, moved about)

(verb)

3rd person , singular, active, past imperfect (laṅ) of √car

Imperfect

Imperfect 3rd person singular of √car with upasargas vi- and ā-

Prefixes: vi+ā

Root: car (class 1)

च (ca) - and, also

(indeclinable)

अपि (api) - also (also, even, too)

(indeclinable)

तत्र (tatra) - there (within the chamber) (there, in that place)

(indeclinable)

Derived from tad

असौ (asau) - that one (Uśanā) (that one (masculine/feminine nominative singular or neuter nominative/accusative dual))

(pronoun)

Nominative, masculine, singular of adas

adas - that, yonder

Note: Refers to Uśanā.

महात्मा (mahātmā) - great-souled one (great-souled, noble, magnanimous)

(noun)

Nominative, masculine, singular of mahātman

mahātman - great-souled, noble

Compound type : karmadhāraya (mahat+ātman)

• mahat – great, large, important
  adjective (neuter)
• ātman – self, soul, spirit, essential nature
  noun (masculine)
  Root: an (class 2)

भृगुनन्दनः (bhṛgunandanaḥ) - son of Bhṛgu (Uśanā) (son of Bhṛgu)

(proper noun)

Nominative, masculine, singular of bhṛgunandana

bhṛgunandana - son of Bhṛgu

Compound type : tatpuruṣa (bhṛgu+nandana)

• bhṛgu – Name of a sage
  proper noun (masculine)
• nandana – son, offspring, delighting
  noun (masculine)
  Derived from √nand (to rejoice)
  Root: nand (class 1)