योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-113, verse-24

लहरीवल्लरीवालान्पृष्ठतालिषु माधवान् ।
क्वचिदन्तरविश्रान्तसपरिच्छदमाधवान् ॥ २४ ॥

laharīvallarīvālānpṛṣṭhatāliṣu mādhavān ,
kvacidantaraviśrāntasaparicchadamādhavān 24

24. laharīvallarīvālān pṛṣṭhatāliṣu mādhavān
kvacit antarāviśrāntasaparicchadamādhavān

24. laharīvallarīvālān pṛṣṭhatāliṣu mādhavān
kvacit antarāviśrāntasaparicchadamādhavān

24. Powerful aquatic beings (mādhavān), whose tails are like waving creepers, striking their backs with clapping sounds; and who, in some places, are (like) Madhava (Vishnu) with unceasing retinues within.

Words meanings summery:

• लहरीवल्लरीवालान् (laharīvallarīvālān) - whose tails are like wave-creepers; having tails like wavy vines

• पृष्ठतालिषु (pṛṣṭhatāliṣu) - on their backs with slapping sounds; on their surfaces with clapping

• माधवान् (mādhavān) - powerful aquatic beings or personified aspects of the ocean (the Madhavas; powerful aquatic beings; (aspects of) Vishnu)

• क्वचित् (kvacit) - sometimes; in some places

• अन्तराविश्रान्तसपरिच्छदमाधवान् (antarāviśrāntasaparicchadamādhavān) - those who have Madhavas (Vishnu/powerful beings) with unceasing retinues within them

Words meanings and morphology

लहरीवल्लरीवालान् (laharīvallarīvālān) - whose tails are like wave-creepers; having tails like wavy vines

(adjective)

Accusative, plural of laharīvallarīvāla

laharīvallarīvāla - having tails like wave-creepers

Compound type : Bahuvrihi (laharīvallarī+vāla)

• laharīvallarī – wave-creeper, wavy vine
  noun (feminine)
• vāla – tail, hair of the tail
  noun (masculine)

पृष्ठतालिषु (pṛṣṭhatāliṣu) - on their backs with slapping sounds; on their surfaces with clapping

(noun)

Locative, feminine, plural of pṛṣṭhatāli

pṛṣṭhatāli - slapping on the back, clapping on the surface

Compound type : Tatpurusha (pṛṣṭha+tāli)

• pṛṣṭha – back, surface, rear
  noun (neuter)
• tāli – clap, stroke, slapping sound
  noun (feminine)

माधवान् (mādhavān) - powerful aquatic beings or personified aspects of the ocean (the Madhavas; powerful aquatic beings; (aspects of) Vishnu)

(proper noun)

Accusative, masculine, plural of mādhava

mādhava - Madhava (a name of Vishnu/Krishna); a powerful being; charming; related to spring

क्वचित् (kvacit) - sometimes; in some places

(indeclinable)

अन्तराविश्रान्तसपरिच्छदमाधवान् (antarāviśrāntasaparicchadamādhavān) - those who have Madhavas (Vishnu/powerful beings) with unceasing retinues within them

(adjective)

Accusative, plural of antarāviśrāntasaparicchadamādhava

antarāviśrāntasaparicchadamādhava - having Madhavas with unceasing retinues within

Compound type : Bahuvrihi (antara+aviśrānta+saparicchada+mādhava)

• antara – within, internal, inner
  indeclinable
• aviśrānta – unceasing, continuous, restless
  adjective
  Past Passive Participle
  Derived from vi-√śram, negated by 'a'
  Prefixes: a+vi
  Root: śram (class 4)
• saparicchada – with retinue, with attendants, accompanied by equipage
  adjective
• mādhava – Madhava (Vishnu/Krishna), powerful being, charming, related to spring
  proper noun (masculine)