योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-86, verse-40

एकत्रैकार्णवोदग्रवृक्षविश्रान्तमाधवम् ।
एकत्र कल्परजनीनिःशून्यतिमिराकुलम् ॥ ४० ॥

ekatraikārṇavodagravṛkṣaviśrāntamādhavam ,
ekatra kalparajanīniḥśūnyatimirākulam 40

40. ekatra ekārṇavodagravṛkṣaviśrāntamādhavam
| ekatra kalparajanīniḥśūnyatimirākulam

40. ekatra ekārṇavodagravṛkṣaviśrāntamādhavam
ekatra kalparajanīniḥśūnyatimirākulam

40. On one side, Vishnu (mādhava) rests upon a mighty tree in the single cosmic ocean; on the other side, (it is) pervaded by the utter void and darkness of the night of a cosmic cycle (kalpa).

Words meanings summery:

• एकत्र (ekatra) - in one place, on one side

• एकार्णवोदग्रवृक्षविश्रान्तमाधवम् (ekārṇavodagravṛkṣaviśrāntamādhavam) - Alluding to the Vaṭa-patraśāyin form of Vishnu/Krishna during cosmic dissolution (Vishnu resting on a great tree in the single cosmic ocean)

• एकत्र (ekatra) - in one place, on the other side

• कल्परजनीनिःशून्यतिमिराकुलम् (kalparajanīniḥśūnyatimirākulam) - pervaded by the utter void and darkness of the cosmic night (kalpa)

Words meanings and morphology

एकत्र (ekatra) - in one place, on one side

(indeclinable)

adverb formed from eka (one) + -tra (suffix indicating place)

एकार्णवोदग्रवृक्षविश्रान्तमाधवम् (ekārṇavodagravṛkṣaviśrāntamādhavam) - Alluding to the Vaṭa-patraśāyin form of Vishnu/Krishna during cosmic dissolution (Vishnu resting on a great tree in the single cosmic ocean)

(noun)

Accusative, masculine, singular of ekārṇavodagravṛkṣaviśrāntamādhava

ekārṇavodagravṛkṣaviśrāntamādhava - Vishnu resting on a mighty tree in the single cosmic ocean

Compound type : bahuvrīhi (eka+arṇava+udagra+vṛkṣa+viśrānta+mādhava)

• eka – one, single, sole
  numeral adjective
• arṇava – ocean, sea
  noun (masculine)
• udagra – great, mighty, lofty, prominent
  adjective
  from ut + agra
  Prefix: ut
• vṛkṣa – tree
  noun (masculine)
• viśrānta – rested, reposed, ceased
  adjective
  Past Passive Participle
  from root śram (to be weary) with prefix vi
  Prefix: vi
  Root: śram (class 4)
• mādhava – Vishnu, Krishna (an epithet)
  proper noun (masculine)
  descendant of Madhu, husband of Mādhava (Lakṣmī)

Note: Compound functioning as a noun in the accusative case, possibly describing a state or an object of vision.

एकत्र (ekatra) - in one place, on the other side

(indeclinable)

adverb formed from eka (one) + -tra (suffix indicating place)

कल्परजनीनिःशून्यतिमिराकुलम् (kalparajanīniḥśūnyatimirākulam) - pervaded by the utter void and darkness of the cosmic night (kalpa)

(adjective)

Accusative, neuter, singular of kalparajanīniḥśūnyatimirākula

kalparajanīniḥśūnyatimirākula - pervaded by the absolute void and darkness of the night of a kalpa

Compound type : bahuvrīhi (kalpa+rajanī+niḥśūnya+timira+ākula)

• kalpa – a cosmic cycle, aeon, fixed rule
  noun (masculine)
• rajanī – night
  noun (feminine)
• niḥśūnya – completely empty, utterly void, desolate
  adjective
  from niḥ + śūnya
  Prefix: niḥ
• timira – darkness, gloom
  noun (neuter)
• ākula – agitated, confused, filled with, pervaded by
  adjective

Note: Describes the environment, possibly referring to 'vyoma' or the general state of the universe.