योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-81, verse-18

दन्तेन्दुमालाविमला विमलोद्दयोतपाततः ।
तमोर्णवोर्द्ध्वलेखेव वृत्तावर्तविवर्तिनी ॥ १८ ॥

dantendumālāvimalā vimaloddayotapātataḥ ,
tamorṇavorddhvalekheva vṛttāvartavivartinī 18

18. danta-indu-mālā-vimalā vimala-uddyota-pātataḥ
tamas-arṇava-ūrdhva-lekhā iva vṛtta-āvarta-vivartinī

18. sā danta-indu-mālā-vimalā vimala-uddyota-pātataḥ
tamas-arṇava-ūrdhva-lekhā iva vṛtta-āvarta-vivartinī

18. She is pure, having a garland of moon-like teeth, (shining forth) from the emission of pure radiance. She appears like a line ascending above the ocean of darkness, revolving in circular eddies.

Words meanings summery:

• दन्त-इन्दु-माला-विमला (danta-indu-mālā-vimalā) - she who is pure with a garland of moon-like teeth

• विमल-उद्द्योत-पाततः (vimala-uddyota-pātataḥ) - from the emission/showering of pure radiance

• तमस्-अर्णव-ऊर्ध्व-लेखा (tamas-arṇava-ūrdhva-lekhā) - a line rising above the ocean of darkness

• इव (iva) - like, as, as if

• वृत्त-आवर्त-विवर्तिनी (vṛtta-āvarta-vivartinī) - whirling in circular eddies/whirlpools

Words meanings and morphology

दन्त-इन्दु-माला-विमला (danta-indu-mālā-vimalā) - she who is pure with a garland of moon-like teeth

(adjective)

Nominative, feminine, singular of danta-indu-mālā-vimala

danta-indu-mālā-vimala - having a pure garland of moon-like teeth

Compound type : bahuvrīhi (danta+indu+mālā+vimala)

• danta – tooth, tusk
  noun (masculine)
  from dam (to tame) or daṃś (to bite)
  Root: dam (class 1)
• indu – moon, drop
  noun (masculine)
• mālā – garland, wreath, series
  noun (feminine)
• vimala – pure, spotless, clean
  adjective (masculine)
  vi (prefix, indicating absence) + mala (impurity)
  Prefix: vi

विमल-उद्द्योत-पाततः (vimala-uddyota-pātataḥ) - from the emission/showering of pure radiance

(noun)

Ablative, masculine, singular of vimala-uddyota-pāta

vimala-uddyota-pāta - emission of pure radiance

Compound type : ṣaṣṭhī-tatpuruṣa (vimala+uddyota+pāta)

• vimala – pure, spotless
  adjective (masculine)
  vi (prefix) + mala (impurity)
  Prefix: vi
• uddyota – radiance, brilliance, illumination
  noun (masculine)
  from ud (prefix) + dyut (to shine)
  Prefix: ud
  Root: dyut (class 1)
• pāta – falling, descent, emission, shower
  noun (masculine)
  from pat (to fall)
  Root: pat (class 1)

तमस्-अर्णव-ऊर्ध्व-लेखा (tamas-arṇava-ūrdhva-lekhā) - a line rising above the ocean of darkness

(noun)

Nominative, feminine, singular of tamas-arṇava-ūrdhva-lekhā

tamas-arṇava-ūrdhva-lekhā - a line rising above the ocean of darkness

Compound type : tatpuruṣa (tamas+arṇava+ūrdhva+lekhā)

• tamas – darkness, gloom
  noun (neuter)
• arṇava – ocean, sea
  noun (masculine)
  from ṛ (to go, move)
  Root: ṛ (class 1)
• ūrdhva – upward, rising, elevated
  adjective (neuter)
• lekhā – line, streak, writing
  noun (feminine)
  from likh (to scratch, write)
  Root: likh (class 6)

Note: the iva is an indeclinable indicating comparison

इव (iva) - like, as, as if

(indeclinable)

वृत्त-आवर्त-विवर्तिनी (vṛtta-āvarta-vivartinī) - whirling in circular eddies/whirlpools

(adjective)

Nominative, feminine, singular of vṛtta-āvarta-vivartin

vṛtta-āvarta-vivartin - revolving in circular eddies

from vṛtta (circular) + āvarta (whirlpool) + vivartin (revolving)

Compound type : tatpuruṣa (vṛtta+āvarta+vivartin)

• vṛtta – circular, round, occurred, happened
  adjective (neuter)
  Past Passive Participle
  from vṛt (to turn, exist)
  Root: vṛt (class 1)
• āvarta – whirlpool, eddy, turning
  noun (masculine)
  from ā (prefix) + vṛt (to turn)
  Prefix: ā
  Root: vṛt (class 1)
• vivartin – revolving, whirling, transforming
  adjective (masculine)
  Agent Noun suffix (in)
  from vi (prefix) + vṛt (to turn)
  Prefix: vi
  Root: vṛt (class 1)