योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-35, verse-8

कृष्णायसपरीधानवलत्सेनाम्बुभीषणः ।
कबन्धावर्तलेखान्तर्बद्धसैन्यादिभूषणः ॥ ८ ॥

kṛṣṇāyasaparīdhānavalatsenāmbubhīṣaṇaḥ ,
kabandhāvartalekhāntarbaddhasainyādibhūṣaṇaḥ 8

8. kṛṣṇāyasaparīdhānavalatsenāmbubhīṣaṇaḥ
kabandhāvartalekhāntarbaddhasainyādibhūṣaṇaḥ

8. kṛṣṇāyasaparīdhānavalatsenāmbubhīṣaṇaḥ
kabandhāvartalekhāntarbaddhasainyādibhūṣaṇaḥ

8. Whose terrifying waters of the army, clad in black iron armor, are swirling; and whose ornaments are the armies and other elements bound within the lines of whirlpools formed by headless trunks.

Words meanings summery:

• कृष्णायसपरीधानवलत्सेनाम्बुभीषणः (kṛṣṇāyasaparīdhānavalatsenāmbubhīṣaṇaḥ) - describing the battle as having a terrifying army, likened to swirling waters, that is clad in black iron armor (whose terrifying army-waters, clad in black iron armor, are swirling)

• कबन्धावर्तलेखान्तर्बद्धसैन्यादिभूषणः (kabandhāvartalekhāntarbaddhasainyādibhūṣaṇaḥ) - describing the battle as having armies and equipment trapped within horrific whirlpools of headless trunks, serving as gruesome ornaments (whose ornaments are the armies and other elements bound within the lines of whirlpools formed by headless trunks)

Words meanings and morphology

कृष्णायसपरीधानवलत्सेनाम्बुभीषणः (kṛṣṇāyasaparīdhānavalatsenāmbubhīṣaṇaḥ) - describing the battle as having a terrifying army, likened to swirling waters, that is clad in black iron armor (whose terrifying army-waters, clad in black iron armor, are swirling)

(adjective)

Nominative, masculine, singular of kṛṣṇāyasaparīdhānavalatsenāmbubhīṣaṇa

kṛṣṇāyasaparīdhānavalatsenāmbubhīṣaṇa - characterized by terrifying army-waters, swirling and clad in black iron armor

Compound type : Bahuvrihi (kṛṣṇāyasa+parīdhāna+valat+senāmbu+bhīṣaṇa)

• kṛṣṇa – black, dark
  adjective (masculine)
• ayasa – iron
  noun (neuter)
• parīdhāna – clothing, garment, armor
  noun (neuter)
  Derived from verb dhā (to place, wear) with prefix pari.
  Prefix: pari
  Root: √dhā (class 3)
• valat – swirling, moving, turning
  participle (masculine)
  Present Active Participle
  Derived from verb √val (to move, turn).
  Root: √val (class 1)
• senā – army, host
  noun (feminine)
• ambu – water
  noun (neuter)
• bhīṣaṇa – terrifying, dreadful, fearful
  adjective (masculine)
  From causative of √bhī (to fear).
  Root: √bhī (class 3)

Note: This entire compound is an adjective modifying an implied noun like 'the battlefield'.

कबन्धावर्तलेखान्तर्बद्धसैन्यादिभूषणः (kabandhāvartalekhāntarbaddhasainyādibhūṣaṇaḥ) - describing the battle as having armies and equipment trapped within horrific whirlpools of headless trunks, serving as gruesome ornaments (whose ornaments are the armies and other elements bound within the lines of whirlpools formed by headless trunks)

(adjective)

Nominative, masculine, singular of kabandhāvartalekhāntarbaddhasainyādibhūṣaṇa

kabandhāvartalekhāntarbaddhasainyādibhūṣaṇa - characterized by armies and other elements bound within lines of whirlpools of headless trunks as its ornaments

Compound type : Bahuvrihi (kabandha+āvarta+lekhā+antar+baddha+sainya+ādi+bhūṣaṇa)

• kabandha – headless trunk (of a human body)
  noun (masculine)
• āvarta – whirlpool, eddy
  noun (masculine)
  From ā-√vṛt (to turn).
  Prefix: ā
  Root: √vṛt (class 1)
• lekhā – line, streak, row
  noun (feminine)
• antar – within, inside
  indeclinable
• baddha – bound, tied, fixed, contained
  participle (masculine)
  Past Passive Participle
  Derived from verb √bandh (to bind).
  Root: √bandh (class 9)
• sainya – army, soldier, military
  noun (neuter)
  Derived from senā (army).
• ādi – beginning, and so forth, etcetera
  indeclinable
• bhūṣaṇa – ornament, decoration, embellishment
  noun (neuter)
  From √bhūṣ (to adorn).
  Root: √bhūṣ (class 1)

Note: This entire compound is an adjective modifying an implied noun like 'the battlefield'.