महाभारतः mahābhārataḥ - book-1, chapter-52, verse-21

महाकाया महावीर्याः शैलशृङ्गसमुच्छ्रयाः ।
योजनायामविस्तारा द्वियोजनसमायताः ॥२१॥

21. mahākāyā mahāvīryāḥ śailaśṛṅgasamucchrayāḥ ,
yojanāyāmavistārā dviyojanasamāyatāḥ.

21. mahākāyāḥ mahāvīryāḥ śailaśṛṅgasamucchrayāḥ
yojanāyāmavistārāḥ dviyojanasamāyatāḥ

21. They had immense bodies, great prowess, and were as tall as mountain peaks. Some stretched for a Yojana in both length and width, while others were two Yojanas long.

Words meanings summery:

• महाकायाः (mahākāyāḥ) - describing the colossal size of the Nāgas (huge-bodied, gigantic)

• महावीर्याः (mahāvīryāḥ) - emphasizing their formidable power (of great strength/prowess, very powerful)

• शैलशृङ्गसमुच्छ्रयाः (śailaśṛṅgasamucchrayāḥ) - indicating their immense stature (having the height of mountain peaks)

• योजनायामविस्ताराः (yojanāyāmavistārāḥ) - describing their massive dimensions (length and width) (a Yojana in length and breadth)

• द्वियोजनसमायताः (dviyojanasamāyatāḥ) - another description of their vast length (equal to two Yojanas in length, two Yojanas long)

Words meanings and morphology

महाकायाः (mahākāyāḥ) - describing the colossal size of the Nāgas (huge-bodied, gigantic)

(adjective)

Nominative, masculine, plural of mahākāya

mahākāya - of great body, gigantic

Compound type : bahuvrīhi (mahā+kāya)

• mahā – great, large
  adjective
• kāya – body
  noun (masculine)

महावीर्याः (mahāvīryāḥ) - emphasizing their formidable power (of great strength/prowess, very powerful)

(adjective)

Nominative, masculine, plural of mahāvīrya

mahāvīrya - of great strength, very powerful

Compound type : bahuvrīhi (mahā+vīrya)

• mahā – great, large
  adjective
• vīrya – strength, power, prowess, vigor
  noun (neuter)

शैलशृङ्गसमुच्छ्रयाः (śailaśṛṅgasamucchrayāḥ) - indicating their immense stature (having the height of mountain peaks)

(adjective)

Nominative, masculine, plural of śailaśṛṅgasamucchraya

śailaśṛṅgasamucchraya - high as mountain peaks, having the elevation of mountain summits

Compound type : bahuvrīhi (śailaśṛṅga+samucchraya)

• śaila – mountain, rock
  noun (masculine)
• śṛṅga – peak, horn, summit
  noun (neuter)
• samucchraya – height, elevation, rising
  noun (masculine)
  from sam-ud-śri
  Prefixes: sam+ud
  Root: śri (class 1)

योजनायामविस्ताराः (yojanāyāmavistārāḥ) - describing their massive dimensions (length and width) (a Yojana in length and breadth)

(adjective)

Nominative, masculine, plural of yojanāyāmavistāra

yojanāyāmavistāra - a Yojana in length and breadth

Compound type : bahuvrīhi (yojana+āyāma+vistāra)

• yojana – a measure of distance (approx. 8-10 miles)
  noun (neuter)
• āyāma – length, extension
  noun (masculine)
  Root: yam (class 1)
• vistāra – breadth, width, expanse
  noun (masculine)
  Root: stṛ (class 5)

द्वियोजनसमायताः (dviyojanasamāyatāḥ) - another description of their vast length (equal to two Yojanas in length, two Yojanas long)

(adjective)

Nominative, masculine, plural of dviyojanasamāyata

dviyojanasamāyata - two Yojanas long

Compound type : bahuvrīhi (dviyojana+samāyata)

• dvi – two
  numeral
• yojana – a measure of distance (approx. 8-10 miles)
  noun (neuter)
• samāyata – long, extended, stretched
  adjective (masculine)
  past passive participle
  from sam-ā-yam
  Prefixes: sam+ā
  Root: yam (class 1)