योगवासिष्ठः yogavāsiṣṭhaḥ - book-2, chapter-13, verse-51

सुखदोषदशादीर्घा संसारमरुमण्डली ।
जन्तोः शीतलतामेति शीतरश्मेः समप्रभा ॥ ५१ ॥

sukhadoṣadaśādīrghā saṃsāramarumaṇḍalī ,
jantoḥ śītalatāmeti śītaraśmeḥ samaprabhā 51

51. sukhadoṣadaśādīrghā saṃsāramarumaṇḍalī
jantoḥ śītalatām eti śītaraśmeḥ samaprabhā

51. saṃsāramarumaṇḍalī sukhadoṣadaśādīrghā
śītaraśmeḥ samaprabhā jantoḥ śītalatām eti

51. The extensive desert-like cycle (saṃsāra) of worldly existence, prolonged by phases of pleasure and pain, and which appears as radiant as the cool-rayed moon, attains coolness for a living being.

Words meanings summery:

• सुखदोषदशादीर्घा (sukhadoṣadaśādīrghā) - long due to states of pleasure and pain/faults, extensive because of conditions of happiness and defect

• संसारमरुमण्डली (saṁsāramarumaṇḍalī) - the desert-like circle of transmigration (saṃsāra), the desert-circle of worldly existence

• जन्तोः (jantoḥ) - of a living being, for a living being, to a creature

• शीतलताम् (śītalatām) - coolness, coldness, tranquility

• एति (eti) - attains, becomes (goes, comes, attains, reaches, becomes)

• शीतरश्मेः (śītaraśmeḥ) - of the moon (lit. cool-rayed), of the cool-beamed one

• समप्रभा (samaprabhā) - as radiant as (of equal luster/radiance, having similar light, as radiant as)

Words meanings and morphology

सुखदोषदशादीर्घा (sukhadoṣadaśādīrghā) - long due to states of pleasure and pain/faults, extensive because of conditions of happiness and defect

(adjective)

Nominative, feminine, singular of sukhadoṣadaśādīrgha

sukhadoṣadaśādīrgha - long with states of pleasure and defects/pain

Compound type : bahuvrīhi (sukha+doṣa+daśā+dīrgha)

• sukha – pleasure, happiness, joy
  noun (neuter)
• doṣa – fault, defect, vice, pain
  noun (masculine)
• daśā – state, condition, phase, period
  noun (feminine)
• dīrgha – long, extensive, prolonged
  adjective (masculine)

Note: Adjective modifying 'saṃsāramarumaṇḍalī'.

संसारमरुमण्डली (saṁsāramarumaṇḍalī) - the desert-like circle of transmigration (saṃsāra), the desert-circle of worldly existence

(noun)

Nominative, feminine, singular of saṃsāramarumaṇḍalī

saṁsāramarumaṇḍalī - the desert-like circle of transmigration (saṃsāra)

Compound type : karmadhāraya (saṃsāra+maru+maṇḍalī)

• saṃsāra – transmigration, cycle of birth and death, worldly existence
  noun (masculine)
  From prefix sam + root sṛ
  Prefix: sam
  Root: sṛ (class 1)
• maru – desert, waste, wilderness
  noun (masculine)
• maṇḍalī – circle, orb, multitude, region
  noun (feminine)

Note: Subject of the verb 'eti'.

जन्तोः (jantoḥ) - of a living being, for a living being, to a creature

(noun)

Genitive, masculine, singular of jantu

jantu - living being, creature, human, animal

Derived from root jan- (to be born).

Root: jan (class 4)

Note: Indicates for whom the cooling occurs.

शीतलताम् (śītalatām) - coolness, coldness, tranquility

(noun)

Accusative, feminine, singular of śītalatā

śītalatā - coolness, coldness, refreshing quality

Derived from 'śītala' (cool) with the abstract suffix '-tā'.

Note: Object of the verb 'eti'.

एति (eti) - attains, becomes (goes, comes, attains, reaches, becomes)

(verb)

3rd person , singular, active, present (laṭ) of i

Present tense, active voice, 3rd person singular.

Root: i (class 2)

शीतरश्मेः (śītaraśmeḥ) - of the moon (lit. cool-rayed), of the cool-beamed one

(noun)

Genitive, masculine, singular of śītaraśmi

śītaraśmi - moon (lit. cool-rayed)

Compound type : bahuvrīhi (śīta+raśmi)

• śīta – cool, cold
  adjective (masculine)
• raśmi – ray, beam of light, cord
  noun (masculine)

Note: Possessive for 'samaprabhā'.

समप्रभा (samaprabhā) - as radiant as (of equal luster/radiance, having similar light, as radiant as)

(adjective)

Nominative, feminine, singular of samaprabhā

samaprabhā - equal splendor, similar radiance, having equal light

Compound type : bahuvrīhi (sama+prabhā)

• sama – equal, same, similar, even
  adjective
• prabhā – light, radiance, splendor, luster
  noun (feminine)

Note: Adjective for 'saṃsāramarumaṇḍalī', taking 'śītaraśmeḥ' as its possessive.