योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-73, verse-48

सनातन इति प्रोक्तो रुद्र इत्यपि संज्ञितः ।
इन्द्रोपेन्द्रमरुन्मेघशैलजालादिदेहकः ॥ ४८ ॥

sanātana iti prokto rudra ityapi saṃjñitaḥ ,
indropendramarunmeghaśailajālādidehakaḥ 48

48. sanātanaḥ iti proktaḥ rudraḥ iti api saṃjñitaḥ
indropendramarunmeghaśailajālādidehakaḥ

48. sanātanaḥ iti proktaḥ rudraḥ iti api saṃjñitaḥ
indropendramarunmeghaśailajālādidehakaḥ

48. This (entity) is declared as eternal (sanātana) and also designated as Rudra. It takes on bodies such as Indra, Upendra, the Maruts, clouds, mountains, and hosts of others.

Words meanings summery:

• सनातनः (sanātanaḥ) - eternal, perpetual, ancient

• इति (iti) - thus, as, so, this

• प्रोक्तः (proktaḥ) - declared, stated, proclaimed, said

• रुद्रः (rudraḥ) - Rudra (a name of Shiva)

• इति (iti) - thus, as, so, this

• अपि (api) - also, even, too

• संज्ञितः (saṁjñitaḥ) - named, designated, known, called

• इन्द्रोपेन्द्रमरुन्मेघशैलजालादिदेहकः (indropendramarunmeghaśailajālādidehakaḥ) - having the bodies of Indra, Upendra, Maruts, clouds, mountains, hosts, etc.

Words meanings and morphology

सनातनः (sanātanaḥ) - eternal, perpetual, ancient

(adjective)

Nominative, masculine, singular of sanātana

sanātana - eternal, perpetual, ancient, lasting, permanent, traditional

इति (iti) - thus, as, so, this

(indeclinable)

प्रोक्तः (proktaḥ) - declared, stated, proclaimed, said

(participle)

Nominative, masculine, singular of pravac

pravac - declared, stated, proclaimed, said, told

Past Passive Participle

Derived from root 'vac' with prefix 'pra'

Prefix: pra

Root: vac (class 2)

रुद्रः (rudraḥ) - Rudra (a name of Shiva)

(proper noun)

Nominative, masculine, singular of rudra

rudra - Rudra (a Vedic deity, later identified with Shiva), howling, terrible, fierce

इति (iti) - thus, as, so, this

(indeclinable)

अपि (api) - also, even, too

(indeclinable)

संज्ञितः (saṁjñitaḥ) - named, designated, known, called

(participle)

Nominative, masculine, singular of saṃjñita

saṁjñita - named, designated, known, called, specified

Past Passive Participle

Derived from root 'jñā' with prefix 'sam'

Prefix: sam

Root: jñā (class 9)

इन्द्रोपेन्द्रमरुन्मेघशैलजालादिदेहकः (indropendramarunmeghaśailajālādidehakaḥ) - having the bodies of Indra, Upendra, Maruts, clouds, mountains, hosts, etc.

(adjective)

Nominative, masculine, singular of indropendramarunmeghaśailajālādidehaka

indropendramarunmeghaśailajālādidehaka - having the bodies of Indra, Upendra, Maruts, clouds, mountains, hosts, etc.

Compound type : Bahuvrihi (indra+upendra+marut+megha+śaila+jāla+ādi+dehaka)

• indra – Indra (king of devas), lord
  proper noun (masculine)
• upendra – Upendra (a name of Vishnu), younger brother of Indra
  proper noun (masculine)
• marut – Marut (wind deity), wind, air
  noun (masculine)
• megha – cloud
  noun (masculine)
• śaila – mountain, rock, hill
  noun (masculine)
• jāla – net, web, multitude, host, collection
  noun (neuter)
• ādi – beginning, and so on, etcetera
  indeclinable
• dehaka – having a body, corporeal, embodying
  adjective (masculine)
  Derived from 'deha' (body) with suffix '-ka'