योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-83, verse-13

महत्यां मोहयामिन्यामुल्बणोऽज्ञानकौशिकः ।
श्मशान इव वेतालः परिवल्गति हृद्द्रुमे ॥ १३ ॥

mahatyāṃ mohayāminyāmulbaṇo'jñānakauśikaḥ ,
śmaśāna iva vetālaḥ parivalgati hṛddrume 13

13. mahatyām mohayāminyām ulbaṇaḥ ajñānakauśikaḥ
śmaśāna iva vetālaḥ parivalgati hṛddrume

13. mahatyām mohayāminyām ulbaṇaḥ ajñānakauśikaḥ
śmaśāna iva vetālaḥ hṛddrume parivalgati

13. The powerful owl of ignorance (ajñānakauśikaḥ), like a vetāla (ghost) in a cremation ground, wanders about in the heart-tree (hṛddrume) during the great night of delusion (mohayāminyām).

Words meanings summery:

• महत्याम् (mahatyām) - qualifying the 'night of delusion' as profound and extensive (in the great, vast, large)

• मोहयामिन्याम् (mohayāminyām) - in the state of profound spiritual ignorance or bewilderment (in the night of delusion)

• उल्बणः (ulbaṇaḥ) - describing the intense nature of ignorance (excessive, strong, fierce, prominent)

• अज्ञानकौशिकः (ajñānakauśikaḥ) - ignorance personified as an owl, active in the 'night' of delusion (the owl of ignorance)

• श्मशान (śmaśāna) - used in a comparison to evoke a desolate and eerie place (a cremation ground, cemetery)

• इव (iva) - introduces a comparison (like, as, as if)

• वेतालः (vetālaḥ) - part of the comparison, suggesting a sinister and restless entity (a ghost, vampire, demon, vetāla)

• परिवल्गति (parivalgati) - indicates restless, agitated movement (wanders about, flutters, moves around, dances)

• हृद्द्रुमे (hṛddrume) - the mind or inner being, metaphorically represented as a tree (in the heart-tree)

Words meanings and morphology

महत्याम् (mahatyām) - qualifying the 'night of delusion' as profound and extensive (in the great, vast, large)

(adjective)

Locative, feminine, singular of mahat

mahat - great, large, vast, mighty

Root: mah (class 1)

Note: Adjective modifying mohayāminyām

मोहयामिन्याम् (mohayāminyām) - in the state of profound spiritual ignorance or bewilderment (in the night of delusion)

(noun)

Locative, feminine, singular of mohayāminī

mohayāminī - night of delusion

Compound type : Tatpuruṣa (moha+yāminī)

• moha – delusion, infatuation, bewilderment, ignorance
  noun (masculine)
  From √muh (to be bewildered, faint)
  Root: muh (class 4)
• yāminī – night
  noun (feminine)
  Root: yā

उल्बणः (ulbaṇaḥ) - describing the intense nature of ignorance (excessive, strong, fierce, prominent)

(adjective)

Nominative, masculine, singular of ulbaṇa

ulbaṇa - excessive, strong, fierce, prominent, violent

Note: Adjective modifying ajñānakauśikaḥ

अज्ञानकौशिकः (ajñānakauśikaḥ) - ignorance personified as an owl, active in the 'night' of delusion (the owl of ignorance)

(noun)

Nominative, masculine, singular of ajñānakauśika

ajñānakauśika - owl of ignorance

Compound type : Tatpuruṣa (ajñāna+kauśika)

• ajñāna – ignorance, nescience, spiritual ignorance
  noun (neuter)
  Negation of jñāna (knowledge)
  Root: jñā (class 9)
• kauśika – an owl
  noun (masculine)

Note: Subject of the sentence

श्मशान (śmaśāna) - used in a comparison to evoke a desolate and eerie place (a cremation ground, cemetery)

(noun)

Nominative, neuter, singular of śmaśāna

śmaśāna - cremation ground, cemetery

Root: śam (class 1)

Note: Used in comparison śmaśāna iva

इव (iva) - introduces a comparison (like, as, as if)

(indeclinable)

वेतालः (vetālaḥ) - part of the comparison, suggesting a sinister and restless entity (a ghost, vampire, demon, vetāla)

(noun)

Nominative, masculine, singular of vetāla

vetāla - a ghost, vampire, demon, vetāla

Note: Forms part of the simile śmaśāna iva vetālaḥ

परिवल्गति (parivalgati) - indicates restless, agitated movement (wanders about, flutters, moves around, dances)

(verb)

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

Present tense, 3rd person, singular

From root √valg (to move, wander) with prefix pari

Prefix: pari

Root: valg (class 1)

हृद्द्रुमे (hṛddrume) - the mind or inner being, metaphorically represented as a tree (in the heart-tree)

(noun)

Locative, masculine, singular of hṛddruma

hṛddruma - heart-tree, tree of the heart

Compound type : Tatpuruṣa (hṛd+druma)

• hṛd – heart, mind, breast, soul
  noun (neuter)
  Root: hṛ (class 1)
• druma – a tree
  noun (masculine)
  Root: dru (class 1)