योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-78, verse-20

पूरकादिनिजायामादृढाभ्यासादखेदजात् ।
एकान्तध्यानसंयोगात्प्राणस्पन्दो निरुद्ध्यते ॥ २० ॥

pūrakādinijāyāmādṛḍhābhyāsādakhedajāt ,
ekāntadhyānasaṃyogātprāṇaspando niruddhyate 20

20. pūrakādinijāyāmāt dṛḍhābhyāsāt akhedajāt
ekāntadhyānasaṃyogāt prāṇaspandaḥ niruddhyate

20. prāṇaspandaḥ niruddhyate pūrakādinijāyāmāt
dṛḍhābhyāsāt akhedajāt ekāntadhyānasaṃyogāt

20. The pulsation of the vital breath (prāṇa) is restrained through the steadfast practice (abhyāsa) of one's own prolonged breath retention, starting with inhalation (pūraka), a practice that does not cause fatigue, and also through the union with solitary meditation (dhyāna).

Words meanings summery:

• पूरकादिनिजायामात् (pūrakādinijāyāmāt) - from one's own prolonged breath retention starting with pūraka

• दृढाभ्यासात् (dṛḍhābhyāsāt) - from steadfast practice

• अखेदजात् (akhedajāt) - from that which is born without fatigue, or, which does not cause fatigue

• एकान्तध्यानसंयोगात् (ekāntadhyānasaṁyogāt) - from the union with solitary meditation

• प्राणस्पन्दः (prāṇaspandaḥ) - the vibration of the vital breath

• निरुद्ध्यते (niruddhyate) - is restrained, is stopped, is blocked

Words meanings and morphology

पूरकादिनिजायामात् (pūrakādinijāyāmāt) - from one's own prolonged breath retention starting with pūraka

(noun)

Ablative, masculine, singular of pūrakādinijāyāma

pūrakādinijāyāma - one's own prolonged breath retention starting with pūraka

Compound type : tatpuruṣa (pūraka+ādi+nija+āyāma)

• pūraka – inhalation, filling
  noun (masculine)
  Root: pṛ (class 9)
• ādi – beginning, etc., first
  noun (masculine)
• nija – one's own, innate
  adjective (masculine)
• āyāma – prolongation, retention, extension
  noun (masculine)
  derived from √yam (to restrain) with prefix ā-
  Prefix: ā
  Root: yam (class 1)

Note: Refers to the practice of breath retention.

दृढाभ्यासात् (dṛḍhābhyāsāt) - from steadfast practice

(noun)

Ablative, masculine, singular of dṛḍhābhyāsa

dṛḍhābhyāsa - firm practice, steadfast practice

Compound type : karmadhāraya (dṛḍha+abhyāsa)

• dṛḍha – firm, steady, strong
  adjective (masculine)
  Root: dṛṃh (class 1)
• abhyāsa – practice, repetition, study
  noun (masculine)
  derived from √as (to throw) with prefix abhi-
  Prefix: abhi
  Root: as (class 4)

अखेदजात् (akhedajāt) - from that which is born without fatigue, or, which does not cause fatigue

(adjective)

Ablative, masculine, singular of akhedaja

akhedaja - not causing fatigue, free from weariness

Compound type : bahuvrīhi (a+kheda+ja)

• a – not, non-, un-
  indeclinable
  negative particle
• kheda – weariness, fatigue, distress
  noun (masculine)
  Root: khid (class 6)
• ja – born, produced from, causing
  adjective (masculine)
  derived from √jan (to be born)
  Root: jan (class 4)

Note: Qualifies 'dṛḍhābhyāsāt'.

एकान्तध्यानसंयोगात् (ekāntadhyānasaṁyogāt) - from the union with solitary meditation

(noun)

Ablative, masculine, singular of ekāntadhyānasaṃyoga

ekāntadhyānasaṁyoga - union with solitary meditation

Compound type : tatpuruṣa (ekānta+dhyāna+saṃyoga)

• ekānta – solitary, exclusive, private
  adjective (masculine)
• dhyāna – meditation, contemplation
  noun (neuter)
  Root: dhyai (class 1)
• saṃyoga – union, conjunction, connection
  noun (masculine)
  derived from √yuj (to join) with prefix sam-
  Prefix: sam
  Root: yuj (class 7)

प्राणस्पन्दः (prāṇaspandaḥ) - the vibration of the vital breath

(noun)

Nominative, masculine, singular of prāṇaspanda

prāṇaspanda - vibration of the vital breath, pulsation of prāṇa

Compound type : tatpuruṣa (prāṇa+spanda)

• prāṇa – vital breath, life force
  noun (masculine)
  Prefix: pra
  Root: an (class 2)
• spanda – vibration, pulsation, throbbing
  noun (masculine)
  Root: spand (class 1)

निरुद्ध्यते (niruddhyate) - is restrained, is stopped, is blocked

(verb)

3rd person , singular, passive, present (laṭ) of rudh

Present Passive

derived from √rudh with prefix ni-

Prefix: ni

Root: rudh (class 7)