योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-37, verse-4

फेनावर्तविवर्तान्तर्वर्तिनी रसरूपिणी ।
कठिनेन्द्रियसंबन्धे करोति स्पन्दमम्भसाम् ॥ ४ ॥

phenāvartavivartāntarvartinī rasarūpiṇī ,
kaṭhinendriyasaṃbandhe karoti spandamambhasām 4

4. phenāvartavivartāntarvartinī rasarūpiṇī
kaṭhinendriyasaṃbandhe karoti spandam ambhasām

4. phenāvartavivartāntarvartinī rasarūpiṇī
kaṭhinendriyasaṃbandhe ambhasām spandam karoti

4. That essence, residing within the turning and churning foam and embodying the very nature of fluidity, causes the waters to pulsate through its connection with the dense sense organs.

Words meanings summery:

• फेनावर्तविवर्तान्तर्वर्तिनी (phenāvartavivartāntarvartinī) - dwelling within the turning and churning of foam, existing within the internal whirls and eddies of foam

• रसरूपिणी (rasarūpiṇī) - embodying the essence of fluidity, having the nature of fluid essence

• कठिनेन्द्रियसंबन्धे (kaṭhinendriyasaṁbandhe) - in connection with the dense sense organs, in a dense sensory contact

• करोति (karoti) - does, makes, causes

• स्पन्दम् (spandam) - vibration, pulsation, movement

• अम्भसाम् (ambhasām) - of waters

Words meanings and morphology

फेनावर्तविवर्तान्तर्वर्तिनी (phenāvartavivartāntarvartinī) - dwelling within the turning and churning of foam, existing within the internal whirls and eddies of foam

(adjective)

Nominative, feminine, singular of phenāvartavivartāntarvartin

phenāvartavivartāntarvartin - dwelling within the turning and churning of foam

Compound noun acting as an adjective. Formed from 'phena' (foam), 'āvarta' (whirl), 'vivarta' (turning), 'antara' (inside), and 'vartin' (dwelling/existing, derived from root 'vṛt').

Compound type : tatpuruṣa (phena+āvarta+vivarta+antara+vartin)

• phena – foam, froth
  noun (neuter)
• āvarta – whirl, eddy, turn
  noun (masculine)
  Prefix: ā
  Root: vṛt (class 1)
• vivarta – turning, rolling, change, transformation, illusion
  noun (masculine)
  Prefix: vi
  Root: vṛt (class 1)
• antara – inside, within, interval
  indeclinable (neuter)
• vartin – dwelling, existing, being, acting
  adjective (masculine)
  Agent noun/adjective
  Derived from root 'vṛt' (to turn, exist) with suffix '-in'.
  Root: vṛt (class 1)

रसरूपिणी (rasarūpiṇī) - embodying the essence of fluidity, having the nature of fluid essence

(adjective)

Nominative, feminine, singular of rasarūpiṇ

rasarūpiṇ - embodying the essence of fluidity, having the nature of fluid essence

Feminine nominative singular of rasarūpiṇ (a compound). Derived from 'rūpiṇ' (having the form of), related to root 'rūp' (to form).

Compound type : tatpuruṣa (rasa+rūpiṇ)

• rasa – juice, essence, fluid, taste, sentiment
  noun (masculine)
• rūpiṇ – having the form of, embodying, possessing beauty
  adjective (masculine)
  Derived from 'rūpa' (form) with suffix '-in'.
  Root: rūp (class 10)

कठिनेन्द्रियसंबन्धे (kaṭhinendriyasaṁbandhe) - in connection with the dense sense organs, in a dense sensory contact

(noun)

Locative, masculine, singular of kaṭhinendriyasaṃbandha

kaṭhinendriyasaṁbandha - connection with dense sense organs

Locative singular of kaṭhinendriyasaṃbandha (a compound). Internal sandhi 'a' + 'i' = 'e' within 'kaṭhinendriya' is intact.

Compound type : tatpuruṣa (kaṭhina+indriya+saṃbandha)

• kaṭhina – hard, firm, dense, severe
  adjective (masculine)
• indriya – sense organ, faculty, power
  noun (neuter)
  Root: ind (class 1)
• saṃbandha – connection, relation, contact
  noun (masculine)
  Derived from root 'bandh' (to bind) with prefix 'sam'.
  Prefix: sam
  Root: bandh (class 9)

करोति (karoti) - does, makes, causes

(verb)

3rd person , singular, active, present (laṭ) of kṛ

Present active indicative

3rd person singular present active indicative of root 'kṛ'.

Root: kṛ (class 8)

स्पन्दम् (spandam) - vibration, pulsation, movement

(noun)

Accusative, neuter, singular of spanda

spanda - vibration, pulsation, movement

Accusative singular of spanda. Derived from root 'spand' (to tremble, vibrate).

Root: spand (class 1)

अम्भसाम् (ambhasām) - of waters

(noun)

Genitive, neuter, plural of ambhas

ambhas - water

Genitive plural of ambhas (a neuter noun).