योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-147, verse-15

नदीशैलवनादिस्थव्योमताराभ्रसंकुलम् ।
गीताब्धिरणपाठाढ्यपवनारावघर्घरम् ॥ १५ ॥

nadīśailavanādisthavyomatārābhrasaṃkulam ,
gītābdhiraṇapāṭhāḍhyapavanārāvaghargharam 15

15. nadīśailavanādisthavyomatārābhraśaṅkulam
gītābdhiraṇapāṭhāḍhyapavanārāvaghargaram

15. tat nadīśailavanādisthavyomatārābhraśaṅkulam
gītābdhiraṇapāṭhāḍhyapavanārāvaghargaram

15. It is dense with skies, stars, and clouds that appear in or above rivers, mountains, forests, and other such places. It resonates with the rumbling sound of the wind, rich with recitations from the battlefield and the "ocean of the Gītā".

Words meanings summery:

• नदीशैलवनादिस्थव्योमताराभ्रशङ्कुलम् (nadīśailavanādisthavyomatārābhraśaṅkulam) - crowded with skies, stars, and clouds situated in rivers, mountains, forests, and so forth

• गीताब्धिरणपाठाढ्यपवनारावघर्गरम् (gītābdhiraṇapāṭhāḍhyapavanārāvaghargaram) - resonating with the rumbling sound of the wind, rich with recitations from the battlefield and the "ocean of the Gītā"

Words meanings and morphology

नदीशैलवनादिस्थव्योमताराभ्रशङ्कुलम् (nadīśailavanādisthavyomatārābhraśaṅkulam) - crowded with skies, stars, and clouds situated in rivers, mountains, forests, and so forth

(adjective)

neuter, singular of nadīśailavanādisthavyomatārābhraśaṅkula

nadīśailavanādisthavyomatārābhraśaṅkula - crowded with skies, stars, and clouds in/above rivers, mountains, forests, etc.

Compound type : bahuvrīhi (nadī+śaila+vana+ādi+stha+vyoma+tārā+abhra+saṅkula)

• nadī – river
  noun (feminine)
• śaila – mountain, rock
  noun (masculine)
• vana – forest, wood
  noun (neuter)
• ādi – beginning, and so forth, etc.
  indeclinable
• stha – situated, standing, being in
  adjective (masculine)
  agent noun/suffix
  Derived from √sthā (to stand)
  Root: √sthā (class 1)
• vyoma – sky, atmosphere
  noun (neuter)
• tārā – star
  noun (feminine)
• abhra – cloud, sky
  noun (neuter)
• saṅkula – crowded, filled with, dense
  adjective (masculine)
  Prefix: sam
  Root: √kul

गीताब्धिरणपाठाढ्यपवनारावघर्गरम् (gītābdhiraṇapāṭhāḍhyapavanārāvaghargaram) - resonating with the rumbling sound of the wind, rich with recitations from the battlefield and the "ocean of the Gītā"

(adjective)

neuter, singular of gītābdhiraṇapāṭhāḍhyapavanārāvaghargara

gītābdhiraṇapāṭhāḍhyapavanārāvaghargara - noisy with the rumbling of wind, filled with sounds of Gītā, ocean, and battle recitations

Compound type : bahuvrīhi (gītā+abdhi+raṇa+pāṭha+āḍhya+pavana+ārāva+ghargara)

• gītā – song, the Bhagavad Gītā
  proper noun (feminine)
• abdhi – ocean, sea
  noun (masculine)
• raṇa – battle, war, combat
  noun (neuter)
• pāṭha – recitation, reading, lesson
  noun (masculine)
  Root: √paṭh (class 1)
• āḍhya – rich, wealthy, full of, abounding in
  adjective (masculine)
• pavana – wind, air
  noun (masculine)
  Root: √pū
• ārāva – sound, cry, roar
  noun (masculine)
  Prefix: ā
  Root: √ru
• ghargara – rumbling, gurgling sound
  adjective (neuter)