महाभारतः mahābhārataḥ - book-12, chapter-181, verse-20

आदिदेवसमुद्भूता ब्रह्ममूलाक्षयाव्यया ।
सा सृष्टिर्मानसी नाम धर्मतन्त्रपरायणा ॥२०॥

20. ādidevasamudbhūtā brahmamūlākṣayāvyayā ,
sā sṛṣṭirmānasī nāma dharmatantraparāyaṇā.

20. ādidevassamudbhūtā brahmamūlākṣayāvyayā sā
sṛṣṭiḥ mānasī nāma dharmatantraparāyaṇā

20. sā sṛṣṭiḥ ādidevassamudbhūtā brahmamūlākṣayāvyayā
mānasī nāma dharmatantraparāyaṇā

20. That creation, which originates from the Primeval God (ādideva), has Brahman (brahman) as its root, is imperishable and immutable. It is indeed known as mental (mānasī) creation and is entirely dedicated to the system of natural law (dharma).

Words meanings summery:

• आदिदेवस्समुद्भूता (ādidevassamudbhūtā) - sprung/originated from the Primeval God (ādideva)

• ब्रह्ममूलाक्षयाव्यया (brahmamūlākṣayāvyayā) - whose root is Brahman (brahman), imperishable, and immutable

• सा (sā) - that (creation) (that (feminine))

• सृष्टिः (sṛṣṭiḥ) - creation, emanation, production

• मानसी (mānasī) - mental (mānasī) (mental, mind-born, intellectual)

• नाम (nāma) - indeed, known as (by name, indeed, verily)

• धर्मतन्त्रपरायणा (dharmatantraparāyaṇā) - devoted to the system/principle of natural law (dharma)

Words meanings and morphology

आदिदेवस्समुद्भूता (ādidevassamudbhūtā) - sprung/originated from the Primeval God (ādideva)

(adjective)

Nominative, feminine, singular of ādidevassamudbhūta

ādidevassamudbhūta - originated from the Primeval God (ādideva)

Compound formed from ādideva and samudbhūta. Samudbhūta is a past passive participle from sam-ud-bhū (to rise, originate). This whole is a Bahuvrihi.

Compound type : bahuvrīhi (ādideva+samudbhūta)

• ādideva – Primeval God, first deity
  noun (masculine)
  Compound of ādi (first, primeval) + deva (god).
• samudbhūta – sprung forth, originated, produced
  adjective
  Past Passive Participle
  From sam-ud-bhū (to arise, originate)
  Prefixes: sam+ud
  Root: bhū (class 1)

ब्रह्ममूलाक्षयाव्यया (brahmamūlākṣayāvyayā) - whose root is Brahman (brahman), imperishable, and immutable

(adjective)

Nominative, feminine, singular of brahmamūlākṣayāvyaya

brahmamūlākṣayāvyaya - having Brahman (brahman) as its root, imperishable, and immutable

Descriptive Bahuvrihi compound: brahmamūla (whose root is Brahman) + akṣaya (imperishable) + avyaya (immutable).

Compound type : bahuvrīhi (brahmamūla+akṣaya+avyaya)

• brahman – the Absolute, universal spirit, creative principle (neuter); a priest (masculine)
  noun (neuter)
  Root: bṛh (class 1)
• mūla – root, origin, foundation
  noun (neuter)
• akṣaya – imperishable, indestructible, inexhaustible
  adjective
  From a-kṣi (not to perish).
  Prefix: a
  Root: kṣi (class 1)
• avyaya – immutable, imperishable, unchanging, undeclining
  adjective
  From a-vyaya (not spending, not decaying).
  Prefix: a
  Root: vyay

सा (sā) - that (creation) (that (feminine))

(pronoun)

Nominative, feminine, singular of tad

tad - that, he, she, it

Feminine nominative singular of 'tad'.

Note: Refers to sṛṣṭiḥ.

सृष्टिः (sṛṣṭiḥ) - creation, emanation, production

(noun)

Nominative, feminine, singular of sṛṣṭi

sṛṣṭi - creation, production, emission, nature

From root sṛj (to create).

Root: sṛj (class 6)

Note: Subject of the sentence.

मानसी (mānasī) - mental (mānasī) (mental, mind-born, intellectual)

(adjective)

Nominative, feminine, singular of mānasa

mānasa - mental, relating to the mind; mind-born

From manas (mind) + aṇ suffix, then feminine ī ending.

Root: man (class 4)

Note: Agrees with sṛṣṭiḥ.

नाम (nāma) - indeed, known as (by name, indeed, verily)

(indeclinable)

धर्मतन्त्रपरायणा (dharmatantraparāyaṇā) - devoted to the system/principle of natural law (dharma)

(adjective)

Nominative, feminine, singular of dharmatantraparāyaṇa

dharmatantraparāyaṇa - devoted to, intent on, engaged in the system/principle of natural law (dharma)

Compound formed from dharmatantra and parāyaṇa. Bahuvrihi: dharmatantre parāyaṇā sā (She for whom dharmatantra is the supreme object).

Compound type : bahuvrīhi (dharmatantra+parāyaṇa)

• dharma – natural law, constitution, intrinsic nature, duty, righteousness
  noun (masculine)
  From root dhṛ (to uphold).
  Root: dhṛ (class 1)
• tantra – system, doctrine, principle, treatise
  noun (neuter)
  From tan (to extend, compose).
  Root: tan (class 8)
• para – supreme, highest, ultimate; other, distant
  adjective
• ayana – going, course, path, resort, shelter
  noun (neuter)
  From root i (to go).
  Root: i (class 2)