वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-4, chapter-37, verse-31

अर्बुदैरर्बुदशतैर्मध्यैश्चान्तैश्च वानराः ।
समुद्रैश्च परार्धैश्च हरयो हरियूथपाः ॥३१॥

31. arbudairarbudaśatairmadhyaiścāntaiśca vānarāḥ ,
samudraiśca parārdhaiśca harayo hariyūthapāḥ.

31. arbudaiḥ arbudasataiḥ madhyaiḥ ca antaiḥ ca vānarāḥ
samudraiḥ ca parārdhaiḥ ca harayaḥ hariyūthapāḥ

31. vānarāḥ harayaḥ hariyūthapāḥ arbudaiḥ arbudasataiḥ
ca madhyaiḥ ca antaiḥ ca samudraiḥ ca parārdhaiḥ ca

31. Monkeys, including their troop leaders, will come numbering in arbudas (hundreds of millions), hundreds of arbudas, madhyas (ten quintillion), antas (one septillion), samudras (ten septillion), and parārdhas (one hundred octillion).

Words meanings summery:

• अर्बुदैः (arbudaiḥ) - by arbudas (a large number, hundreds of millions)

• अर्बुदसतैः (arbudasataiḥ) - by hundreds of arbudas

• मध्यैः (madhyaiḥ) - by madhyas (a very large number, 10^18)

• च (ca) - and, also

• अन्तैः (antaiḥ) - by antas (a very large number, 10^12 or 10^19)

• च (ca) - and, also

• वानराः (vānarāḥ) - monkeys

• समुद्रैः (samudraiḥ) - by samudras (a very large number, 10^10 or 10^20)

• च (ca) - and, also

• परार्धैः (parārdhaiḥ) - by parārdhas (a very large number, 10^14 or 10^21)

• च (ca) - and, also

• हरयः (harayaḥ) - monkeys, brown/tawny ones

• हरियूथपाः (hariyūthapāḥ) - monkey troop leaders

Words meanings and morphology

अर्बुदैः (arbudaiḥ) - by arbudas (a large number, hundreds of millions)

(noun)

Instrumental, neuter, plural of arbuda

arbuda - one hundred million, a large number, a cloud

अर्बुदसतैः (arbudasataiḥ) - by hundreds of arbudas

(noun)

Instrumental, neuter, plural of arbudasata

arbudasata - hundreds of arbudas

Compound type : tatpuruṣa (arbuda+śata)

• arbuda – one hundred million, a large number
  noun (neuter)
• śata – hundred
  noun (neuter)

मध्यैः (madhyaiḥ) - by madhyas (a very large number, 10^18)

(noun)

Instrumental, neuter, plural of madhya

madhya - middle, centre, a very large number (e.g., 10^18)

च (ca) - and, also

(indeclinable)

अन्तैः (antaiḥ) - by antas (a very large number, 10^12 or 10^19)

(noun)

Instrumental, masculine, plural of anta

anta - end, limit, a very large number (e.g., 10^12 or 10^19)

च (ca) - and, also

(indeclinable)

वानराः (vānarāḥ) - monkeys

(noun)

Nominative, masculine, plural of vānara

vānara - monkey

समुद्रैः (samudraiḥ) - by samudras (a very large number, 10^10 or 10^20)

(noun)

Instrumental, masculine, plural of samudra

samudra - ocean, sea, a very large number (e.g., 10^10 or 10^20)

च (ca) - and, also

(indeclinable)

परार्धैः (parārdhaiḥ) - by parārdhas (a very large number, 10^14 or 10^21)

(noun)

Instrumental, neuter, plural of parārdha

parārdha - the other half, a very large number (e.g., 10^14 or 10^21)

च (ca) - and, also

(indeclinable)

हरयः (harayaḥ) - monkeys, brown/tawny ones

(noun)

Nominative, masculine, plural of hari

hari - monkey, brown, tawny, lion, Viṣṇu

Note: Synonym for Vānaras.

हरियूथपाः (hariyūthapāḥ) - monkey troop leaders

(noun)

Nominative, masculine, plural of hariyūthapa

hariyūthapa - leader of monkey troops

Compound type : tatpuruṣa (hari+yūthapa)

• hari – monkey
  noun (masculine)
• yūthapa – troop leader
  noun (masculine)
  From yūtha (troop) + pa (protector/leader), from root √pā (to protect).
  Root: pā (class 2)