वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-7, chapter-28, verse-18

गृहीत्वा तं तु नप्तारं प्रविष्टः स महोदधिम् ।
मातामहो ऽर्यकस्तस्य पौलोमी येन सा शची ॥१८॥

18. gṛhītvā taṃ tu naptāraṃ praviṣṭaḥ sa mahodadhim ,
mātāmaho'ryakastasya paulomī yena sā śacī.

18. gṛhītvā tam tu naptāram praviṣṭaḥ saḥ mahodadhim
mātāmahaḥ aryakaḥ tasya paulomī yena sā śacī

18. saḥ mātāmahaḥ aryakaḥ yena sā śacī paulomī tasya
tam naptāram gṛhītvā tu mahodadhim praviṣṭaḥ

18. Having seized that grandson (Jayanta), he (Puloma), who was his maternal grandfather (because Śacī, Jayanta's mother, is Paulomī, daughter of Puloma), entered the great ocean.

Words meanings summery:

• गृहीत्वा (gṛhītvā) - having taken, having seized

• तम् (tam) - him (Jayanta) (him, that)

• तु (tu) - but, indeed, however

• नप्तारम् (naptāram) - grandson (Jayanta) (grandson)

• प्रविष्टः (praviṣṭaḥ) - entered

• सः (saḥ) - he (Puloma) (he, that)

• महोदधिम् (mahodadhim) - into the great ocean

• मातामहः (mātāmahaḥ) - maternal grandfather (Puloma) (maternal grandfather)

• अर्यकः (aryakaḥ) - Aryaka (often identified with Puloma or his ancestor) (Aryaka (a name))

• तस्य (tasya) - his (Jayanta's) (his, of him)

• पौलोमी (paulomī) - Śacī, daughter of Puloma (daughter of Puloma)

• येन (yena) - because of whom (Puloma) (by whom, because of whom)

• सा (sā) - she (Śacī) (she, that (feminine))

• शची (śacī) - Śacī (name of Indra's wife)

Words meanings and morphology

गृहीत्वा (gṛhītvā) - having taken, having seized

(indeclinable)

Absolutive (Gerund)

from root grah with suffix ktvā

Root: grah (class 9)

तम् (tam) - him (Jayanta) (him, that)

(pronoun)

Accusative, masculine, singular of tad

tad - that, he, she, it

Note: Refers to Jayanta.

तु (tu) - but, indeed, however

(indeclinable)

नप्तारम् (naptāram) - grandson (Jayanta) (grandson)

(noun)

Accusative, masculine, singular of naptṛ

naptṛ - grandson, descendant

Note: Refers to Jayanta, son of Śacī.

प्रविष्टः (praviṣṭaḥ) - entered

(adjective)

Nominative, masculine, singular of praviṣṭa

praviṣṭa - entered, gone into

Past Passive Participle

from prefix pra + root viś (to enter)

Prefix: pra

Root: viś (class 6)

सः (saḥ) - he (Puloma) (he, that)

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

Note: Refers to Puloma.

महोदधिम् (mahodadhim) - into the great ocean

(noun)

Accusative, masculine, singular of mahodadhi

mahodadhi - great ocean

Compound type : karma-dhāraya (mahā+udadhi)

• mahā – great, large
  adjective
• udadhi – ocean, sea
  noun (masculine)

मातामहः (mātāmahaḥ) - maternal grandfather (Puloma) (maternal grandfather)

(noun)

Nominative, masculine, singular of mātāmaha

mātāmaha - maternal grandfather

Compound type : tatpurusha (mātṛ+maha)

• mātṛ – mother
  noun (feminine)
• maha – great, eminent (often used as suffix in kinship terms)
  adjective (masculine)

Note: Refers to Puloma.

अर्यकः (aryakaḥ) - Aryaka (often identified with Puloma or his ancestor) (Aryaka (a name))

(proper noun)

Nominative, masculine, singular of Aryaka

Aryaka - name of a chief among the Nagas, or Puloma's father. Here, likely used as an epithet or ancestral reference for Puloma.

तस्य (tasya) - his (Jayanta's) (his, of him)

(pronoun)

Genitive, masculine, singular of tad

tad - that, he, she, it

Note: Refers to Jayanta.

पौलोमी (paulomī) - Śacī, daughter of Puloma (daughter of Puloma)

(noun)

Nominative, feminine, singular of paulomī

paulomī - daughter of Puloma

patronymic from Puloma

येन (yena) - because of whom (Puloma) (by whom, because of whom)

(pronoun)

Instrumental, masculine, singular of yad

yad - who, which, what

Note: Refers to Puloma, indicating the reason for Śacī being Paulomī.

सा (sā) - she (Śacī) (she, that (feminine))

(pronoun)

Nominative, feminine, singular of tad

tad - that, he, she, it

Note: Refers to Śacī.

शची (śacī) - Śacī (name of Indra's wife)

(proper noun)

Nominative, feminine, singular of Śacī

Śacī - name of Indra's wife, daughter of Puloma