वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-6, chapter-14, verse-20

ऊर्मयः सिन्धुराजस्य सनक्रमकरास्तदा ।
विन्ध्यमन्दरसंकाशाः समुत्पेतुः सहस्रशः ॥२०॥

20. ūrmayaḥ sindhurājasya sanakramakarāstadā ,
vindhyamandarasaṃkāśāḥ samutpetuḥ sahasraśaḥ.

20. ūrmayaḥ sindhu-rājasya sa-nakra-makarāḥ tadā
vindhya-mandara-saṃkāśāḥ samutpetuḥ sahasraśaḥ

20. tadā sindhu-rājasya sa-nakra-makarāḥ
vindhya-mandara-saṃkāśāḥ ūrmayaḥ sahasraśaḥ samutpetuḥ

20. Then, thousands of waves of the ocean (sindhurāja), teeming with crocodiles and sea-monsters, and resembling the Vindhya and Mandara mountains, surged upwards.

Words meanings summery:

• ऊर्मयः (ūrmayaḥ) - waves

• सिन्धु-राजस्य (sindhu-rājasya) - of the ocean (of the king of rivers, of the ocean)

• स-नक्र-मकराः (sa-nakra-makarāḥ) - teeming with crocodiles and sea-monsters (with crocodiles and sea-monsters)

• तदा (tadā) - then, at that time

• विन्ध्य-मन्दर-संकाशाः (vindhya-mandara-saṁkāśāḥ) - resembling Vindhya and Mandara mountains

• समुत्पेतुः (samutpetuḥ) - sprang up, arose, surged upwards

• सहस्रशः (sahasraśaḥ) - by thousands, in thousands

Words meanings and morphology

ऊर्मयः (ūrmayaḥ) - waves

(noun)

Nominative, masculine, plural of ūrmi

ūrmi - wave, surge, current

सिन्धु-राजस्य (sindhu-rājasya) - of the ocean (of the king of rivers, of the ocean)

(noun)

Genitive, masculine, singular of sindhu-rāja

sindhu-rāja - king of rivers (i.e., ocean), lord of the sea

Tatpurusha compound: 'sindhu' (river, ocean) + 'rāja' (king).

Compound type : tatpurusha (sindhu+rāja)

• sindhu – river, ocean
  noun (masculine)
• rāja – king, ruler
  noun (masculine)

स-नक्र-मकराः (sa-nakra-makarāḥ) - teeming with crocodiles and sea-monsters (with crocodiles and sea-monsters)

(adjective)

Nominative, masculine, plural of sa-nakra-makara

sa-nakra-makara - having crocodiles and sea-monsters

Bahuvrihi compound: 'sa' (with) + 'nakra' (crocodile) + 'makara' (sea-monster).

Compound type : bahuvrihi (sa+nakra+makara)

• sa – with, together with
  indeclinable
• nakra – crocodile
  noun (masculine)
• makara – sea-monster, a mythical aquatic animal (often depicted as a crocodile or dolphin)
  noun (masculine)

तदा (tadā) - then, at that time

(indeclinable)

Derived from pronominal stem 'tad' with suffix '-dā'.

विन्ध्य-मन्दर-संकाशाः (vindhya-mandara-saṁkāśāḥ) - resembling Vindhya and Mandara mountains

(adjective)

Nominative, masculine, plural of vindhya-mandara-saṃkāśa

vindhya-mandara-saṁkāśa - resembling Vindhya and Mandara (mountains)

Tatpurusha compound: 'Vindhya' (mountain name) + 'Mandara' (mountain name) + 'saṃkāśa' (resembling).

Compound type : tatpurusha (vindhya+mandara+saṃkāśa)

• vindhya – Vindhya mountain range
  proper noun (masculine)
• mandara – Mandara mountain (used for churning the ocean)
  proper noun (masculine)
• saṃkāśa – resembling, like, similar to
  adjective (masculine)
  Prefix: sam

समुत्पेतुः (samutpetuḥ) - sprang up, arose, surged upwards

(verb)

3rd person , plural, active, past perfect (lit) of sam-ut-pat

Prefixes: sam+ut

Root: pat (class 1)

सहस्रशः (sahasraśaḥ) - by thousands, in thousands

(indeclinable)

Derived from 'sahasra' (thousand) with suffix '-śaḥ'.