योगवासिष्ठः yogavāsiṣṭhaḥ - book-1, chapter-22, verse-22

जरा ज्योत्स्नोदितैवेयं शिरःशिखरिपृष्ठतः ।
विकासयति संरब्धं वातकासकुमुद्वती ॥ २२ ॥

jarā jyotsnoditaiveyaṃ śiraḥśikharipṛṣṭhataḥ ,
vikāsayati saṃrabdhaṃ vātakāsakumudvatī 22

22. jarā jyotsnā uditā eva iyam śiraḥśikhari-pṛṣṭhataḥ
vikāsayati saṃrabdham vātakāsa-kumudvatī

22. iyam jarā śiraḥśikhari-pṛṣṭhataḥ uditā jyotsnā
iva saṃrabdham vātakāsa-kumudvatī vikāsayati

22. Old age (jarā) is like the rising moonlight which, emerging from behind the peak of the head, vigorously causes the night-blooming water-lilies of cough and other wind-related ailments to blossom.

Words meanings summery:

• जरा (jarā) - old age (old age, decrepitude)

• ज्योत्स्ना (jyotsnā) - moonlight (moonlight, moonshine)

• उदिता (uditā) - risen (risen, appeared, ascended)

• एव (eva) - indeed, like (only, just, indeed, quite)

• इयम् (iyam) - this (this (feminine))

• शिरःशिखरि-पृष्ठतः (śiraḥśikhari-pṛṣṭhataḥ) - from behind the peak of the head (from the back of the mountain peak of the head)

• विकासयति (vikāsayati) - causes to blossom, makes to appear (causes to blossom, expands, reveals)

• संरब्धम् (saṁrabdham) - vigorously, intensely (vigorously, intensely, agitatedly, fiercely)

• वातकास-कुमुद्वती (vātakāsa-kumudvatī) - night-blooming water-lilies of cough and wind-related ailments (night-lotus-like ailment of wind and cough)

Words meanings and morphology

जरा (jarā) - old age (old age, decrepitude)

(noun)

Nominative, feminine, singular of jarā

jarā - old age, decrepitude, decay

ज्योत्स्ना (jyotsnā) - moonlight (moonlight, moonshine)

(noun)

Nominative, feminine, singular of jyotsnā

jyotsnā - moonlight, moonshine

उदिता (uditā) - risen (risen, appeared, ascended)

(adjective)

Nominative, feminine, singular of udita

udita - risen, appeared, ascended, spoken

Past Passive Participle

From root 'i' (to go) with upasarga 'ud'.

Prefix: ud

Root: i (class 2)

Note: Adjective modifying 'jyotsnā'.

एव (eva) - indeed, like (only, just, indeed, quite)

(indeclinable)

Note: Used here to emphasize the comparison, similar to 'iva'.

इयम् (iyam) - this (this (feminine))

(pronoun)

Nominative, feminine, singular of idam

idam - this

Note: Refers to 'jarā'.

शिरःशिखरि-पृष्ठतः (śiraḥśikhari-pṛṣṭhataḥ) - from behind the peak of the head (from the back of the mountain peak of the head)

(indeclinable)

Derived from 'śiraḥśikhara-pṛṣṭha' with the suffix 'tas' (from).

Compound type : tatpurusha (śiras+śikhara+pṛṣṭha)

• śiras – head, top
  noun (neuter)
• śikhara – peak, summit, crest, top
  noun (masculine)
• pṛṣṭha – back, rear, surface, page
  noun (neuter)

Note: Used adverbially to indicate origin or location.

विकासयति (vikāsayati) - causes to blossom, makes to appear (causes to blossom, expands, reveals)

(verb)

3rd person , singular, active, present (lat) of vikāsaya

Causative verb

Causative of root 'kas' (to open, shine) with upasarga 'vi'. The 'ā' is inherent in the root 'kās'.

Prefix: vi

Root: kas (class 1)

संरब्धम् (saṁrabdham) - vigorously, intensely (vigorously, intensely, agitatedly, fiercely)

(indeclinable)

Past Passive Participle

From root 'rabh' (to seize, begin) with upasarga 'sam'.

Prefix: sam

Root: rabh (class 1)

Note: Used adverbially.

वातकास-कुमुद्वती (vātakāsa-kumudvatī) - night-blooming water-lilies of cough and wind-related ailments (night-lotus-like ailment of wind and cough)

(noun)

Nominative, feminine, singular of vātakāsakumudvatī

vātakāsakumudvatī - a collection of kumud flowers of wind and cough

Compound type : tatpurusha (vāta+kāsa+kumudvatī)

• vāta – wind, air, a humor of the body (doṣa)
  noun (masculine)
• kāsa – cough, coughing
  noun (masculine)
• kumudvatī – a cluster of water-lilies, a pond abounding in water-lilies, having water-lilies
  noun (feminine)
  Derived from 'kumuda' (water-lily) with possessive suffix 'mat/vat' and feminine ending 'ī'.

Note: The object of 'vikāsayati'. The 'nominative' case might imply it is also an adjective of 'jarā' (old age), but the syntax suggests it is the object of the causative verb.