योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-24, verse-18

पर्यन्तस्थितकूष्माण्डरक्षःपैशाचमण्डलम् ।
वातस्कन्धमहावेगवहद्वैमानिकव्रजम् ॥ १८ ॥

paryantasthitakūṣmāṇḍarakṣaḥpaiśācamaṇḍalam ,
vātaskandhamahāvegavahadvaimānikavrajam 18

18. paryantasthitakūṣmāṇḍarakṣaḥpaiśācamaṇḍalam
vātaskandhamahāvegavahadvaimānikavrajanam

18. paryantasthitakūṣmāṇḍarakṣaḥpaiśācamaṇḍalam
vātaskandhamahāvegavahadvaimānikavrajanam

18. At its borders are situated multitudes of kūṣmāṇḍa, rākṣasa, and piśāca demons, and it contains throngs of aerial chariots (or their occupants) moving with the immense speed of a powerful gale.

Words meanings summery:

• पर्यन्तस्थितकूष्माण्डरक्षःपैशाचमण्डलम् (paryantasthitakūṣmāṇḍarakṣaḥpaiśācamaṇḍalam) - a place at whose borders are situated multitudes of kūṣmāṇḍa, rākṣasa, and piśāca demons (whose borders are occupied by groups of kūṣmāṇḍa, rākṣasa, and piśāca demons)

• वातस्कन्धमहावेगवहद्वैमानिकव्रजनम् (vātaskandhamahāvegavahadvaimānikavrajanam) - a place containing throngs of aerial chariots (or their occupants) moving with the immense speed of a powerful gale (where a multitude of aviators (or aerial chariots) moves with the great speed of a mighty wind)

Words meanings and morphology

पर्यन्तस्थितकूष्माण्डरक्षःपैशाचमण्डलम् (paryantasthitakūṣmāṇḍarakṣaḥpaiśācamaṇḍalam) - a place at whose borders are situated multitudes of kūṣmāṇḍa, rākṣasa, and piśāca demons (whose borders are occupied by groups of kūṣmāṇḍa, rākṣasa, and piśāca demons)

(adjective)

Accusative, neuter, singular of paryantasthitakūṣmāṇḍarakṣaḥpaiśācamaṇḍala

paryantasthitakūṣmāṇḍarakṣaḥpaiśācamaṇḍala - characterized by groups of kūṣmāṇḍa, rākṣasa, and piśāca demons located at its borders

Compound type : Bahuvrīhi (paryantasthita+kūṣmāṇḍa+rakṣas+paiśāca+maṇḍala)

• paryantasthita – situated at the border/edge, standing on the periphery
  adjective (neuter)
• kūṣmāṇḍa – a type of demon or imp, often attendants of Śiva or Yama
  noun (masculine)
• rakṣas – rākṣasa, demon, evil spirit
  noun (masculine)
• paiśāca – relating to piśācas (a class of malevolent beings or ghouls), goblin-like
  adjective (masculine)
  Derived from 'piśāca' (ghoul)
• maṇḍala – circle, group, multitude, assembly, region, district
  noun (neuter)

Note: Accusative singular neuter, modifying an implied noun like 'sthānam'.

वातस्कन्धमहावेगवहद्वैमानिकव्रजनम् (vātaskandhamahāvegavahadvaimānikavrajanam) - a place containing throngs of aerial chariots (or their occupants) moving with the immense speed of a powerful gale (where a multitude of aviators (or aerial chariots) moves with the great speed of a mighty wind)

(adjective)

Accusative, neuter, singular of vātaskandhamahāvegavahadvaimānikavraja

vātaskandhamahāvegavahadvaimānikavraja - characterized by multitudes of aviators/vimānas moving with the great speed of a mighty wind

Compound type : Bahuvrīhi (vātaskandha+mahāvega+vahad+vaimānika+vraja)

• vātaskandha – mass of wind, mighty wind, powerful gust
  noun (masculine)
• mahāvega – great speed, immense velocity
  noun (masculine)
• vahad – moving, carrying, flowing, conveying
  adjective (neuter)
  Present Active Participle
  From root 'vah' (to carry, move, flow)
  Root: vah (class 1)
• vaimānika – relating to a vimāna (aerial chariot), an aviator, an occupant of an aerial car
  noun (masculine)
  Derived from 'vimāna' with '-ika' suffix
• vraja – multitude, flock, herd, troop, company
  noun (masculine)

Note: Accusative singular neuter, modifying an implied noun like 'sthānam'.