महाभारतः mahābhārataḥ - book-13, chapter-4, verse-16

ध्यातमात्रे ऋचीकेन हयानां चन्द्रवर्चसाम् ।
गङ्गाजलात्समुत्तस्थौ सहस्रं विपुलौजसाम् ॥१६॥

16. dhyātamātre ṛcīkena hayānāṁ candravarcasām ,
gaṅgājalātsamuttasthau sahasraṁ vipulaujasām.

16. dhyātamātre ṛcīkena hayānām candravarcasām
gaṅgājalāt samuttasthau sahasram vipulaujasām

16. ṛcīkena dhyātamātre candravarcasām vipulaujasām
hayānām sahasram gaṅgājalāt samuttasthau

16. As soon as Ṛcīka thought of them, a thousand horses, radiant like the moon and possessing immense power, arose from the waters of the Gaṅgā.

Words meanings summery:

• ध्यातमात्रे (dhyātamātre) - as soon as Ṛcīka thought of them (immediately after meditating/thinking, as soon as thought of)

• ऋचीकेन (ṛcīkena) - by Ṛcīka (a sage)

• हयानाम् (hayānām) - of horses

• चन्द्रवर्चसाम् (candravarcasām) - describing the horses as radiant like the moon (of moon-like brilliance)

• गङ्गाजलात् (gaṅgājalāt) - from the water of the Gaṅgā river

• समुत्तस्थौ (samuttasthau) - arose, stood up

• सहस्रम् (sahasram) - a thousand horses (a thousand)

• विपुलौजसाम् (vipulaujasām) - describing the horses as having immense power (of great strength, immense power)

Words meanings and morphology

ध्यातमात्रे (dhyātamātre) - as soon as Ṛcīka thought of them (immediately after meditating/thinking, as soon as thought of)

(adjective)

Locative, neuter, singular of dhyātamātra

dhyātamātra - only thought of, as soon as thought of

Compound type : bahuvrihi (dhyāta+mātra)

• dhyāta – thought, meditated upon
  adjective (neuter)
  Past Passive Participle
  from root dhyā
  Root: dhyā (class 1)
• mātra – only, merely, extent
  indeclinable (neuter)

ऋचीकेन (ṛcīkena) - by Ṛcīka (a sage)

(proper noun)

Instrumental, masculine, singular of ṛcīka

ṛcīka - name of a sage, father of Jamadagni

हयानाम् (hayānām) - of horses

(noun)

Genitive, masculine, plural of haya

haya - horse

Root: hi (class 5)

चन्द्रवर्चसाम् (candravarcasām) - describing the horses as radiant like the moon (of moon-like brilliance)

(adjective)

Genitive, masculine, plural of candravarcas

candravarcas - having the luster/splendor of the moon

Compound type : bahuvrihi (candra+varcas)

• candra – moon
  noun (masculine)
• varcas – luster, splendor, energy
  noun (neuter)

गङ्गाजलात् (gaṅgājalāt) - from the water of the Gaṅgā river

(noun)

Ablative, neuter, singular of gaṅgājala

gaṅgājala - water of the Gaṅgā

Compound type : tatpurusha (gaṅgā+jala)

• gaṅgā – the river Ganges
  proper noun (feminine)
• jala – water
  noun (neuter)

समुत्तस्थौ (samuttasthau) - arose, stood up

(verb)

3rd person , singular, active, perfect (lit) of sthā

Prefixes: sam+ud

Root: sthā (class 1)

सहस्रम् (sahasram) - a thousand horses (a thousand)

(noun)

Nominative, neuter, singular of sahasra

sahasra - a thousand

विपुलौजसाम् (vipulaujasām) - describing the horses as having immense power (of great strength, immense power)

(adjective)

Genitive, masculine, plural of vipulaujas

vipulaujas - of great strength or vigor

Compound type : bahuvrihi (vipula+ojas)

• vipula – large, extensive, immense
  adjective (masculine)
• ojas – power, strength, vigor
  noun (neuter)