योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-15, verse-5

सिद्धगन्धर्वसंघातद्विगुणोत्थविहंगमम् ।
रत्नकान्त्यच्छनीहारद्विगुणत्वग्वृतांशुकम् ॥ ५ ॥

siddhagandharvasaṃghātadviguṇotthavihaṃgamam ,
ratnakāntyacchanīhāradviguṇatvagvṛtāṃśukam 5

5. siddhagandharvasaṃghātadviguṇotthavihaṃgamam
ratnakāntyacchahīhāradviguṇatvagvṛtāṃśukam

5. siddhagandharvasaṃghātadviguṇotthavihaṃgamam
ratnakāntyacchahīhāradviguṇatvagvṛtāṃśukam

5. It had flocks of birds rising, whose numbers were twice that of the assembled Siddhas and Gandharvas, and its covering (or clothing) was twice as lustrous as pure snow due to the brilliance of its jewels.

Words meanings summery:

• सिद्धगन्धर्वसंघातद्विगुणोत्थविहंगमम् (siddhagandharvasaṁghātadviguṇotthavihaṁgamam) - with rising birds whose numbers were twice that of the Siddhas and Gandharvas gathered there

• रत्नकान्त्यच्छहीहारद्विगुणत्वग्वृतांशुकम् (ratnakāntyacchahīhāradviguṇatvagvṛtāṁśukam) - with garments (or a covering) twice as lustrous as the pure snow, due to the brilliance of jewels

Words meanings and morphology

सिद्धगन्धर्वसंघातद्विगुणोत्थविहंगमम् (siddhagandharvasaṁghātadviguṇotthavihaṁgamam) - with rising birds whose numbers were twice that of the Siddhas and Gandharvas gathered there

(adjective)

Accusative, neuter, singular of siddhagandharvasaṃghātadviguṇotthavihaṃgama

siddhagandharvasaṁghātadviguṇotthavihaṁgama - with rising birds whose numbers were twice that of the Siddhas and Gandharvas gathered there

Compound type : bahuvrīhi (siddhagandharvasaṃghāta+dviguṇa+uttha+vihaṃgama)

• siddhagandharvasaṃghāta – gathering/multitude of Siddhas and Gandharvas
  noun (masculine)
• dviguṇa – twofold, double, twice as much
  adjective
• uttha – risen, arisen, sprung up
  adjective
  Past Passive Participle
  derived from root √sthā (to stand) with upasarga ud-
  Prefix: ud
  Root: sthā (class 1)
• vihaṃgama – bird (literally, going in the sky)
  noun (masculine)

Note: Describes the implied mountain/peak.

रत्नकान्त्यच्छहीहारद्विगुणत्वग्वृतांशुकम् (ratnakāntyacchahīhāradviguṇatvagvṛtāṁśukam) - with garments (or a covering) twice as lustrous as the pure snow, due to the brilliance of jewels

(adjective)

Accusative, neuter, singular of ratnakāntyacchahīhāradviguṇatvagvṛtāṃśuka

ratnakāntyacchahīhāradviguṇatvagvṛtāṁśuka - with garments (or a covering) twice as lustrous as the pure snow, due to the brilliance of jewels

Compound type : bahuvrīhi (ratnakānti+accha+hīhāra+dviguṇa+tvagvṛtāṃśuka)

• ratna – jewel, gem
  noun (neuter)
• kānti – lustre, brilliance, beauty
  noun (feminine)
• accha – clear, pure, transparent
  adjective
• hīhāra – snow
  noun (masculine)
• dviguṇa – twofold, double, twice as much
  adjective
• tvagvṛtāṃśuka – covering/garment/clothing (lit. bark-covered cloth)
  noun (neuter)

Note: Describes the implied mountain/peak.