योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-48, verse-43

विदूरथोऽथ मार्तण्डं दीपं ब्रह्माण्डमण्डपे ।
अस्त्रं मन्त्रविदां श्रेष्ठः सृष्ट्वा मन्त्रो व्यचेष्टयत् ॥ ४३ ॥

vidūratho'tha mārtaṇḍaṃ dīpaṃ brahmāṇḍamaṇḍape ,
astraṃ mantravidāṃ śreṣṭhaḥ sṛṣṭvā mantro vyaceṣṭayat 43

43. vidūrathaḥ atha mārtaṇḍam dīpam brahmāṇḍamaṇḍape
astram mantravidām śreṣṭhaḥ sṛṣṭvā mantraḥ vyaceṣṭayat

43. atha mantravidām śreṣṭhaḥ vidūrathaḥ astram mantraḥ
sṛṣṭvā brahmāṇḍamaṇḍape mārtaṇḍam dīpam vyaceṣṭayat

43. Then, Vidūratha, the foremost among those who know mantras (mantra), having created a mantra (mantra) (to be used as) a weapon (astra), set the sun (mārtaṇḍa) in motion as a lamp in the pavilion of the universe (brahmāṇḍamaṇḍapa).

Words meanings summery:

• विदूरथः (vidūrathaḥ) - Vidūratha (a proper name)

• अथ (atha) - then, now, therefore

• मार्तण्डम् (mārtaṇḍam) - the sun

• दीपम् (dīpam) - lamp, light

• ब्रह्माण्डमण्डपे (brahmāṇḍamaṇḍape) - in the pavilion of the universe

• अस्त्रम् (astram) - weapon, missile

• मन्त्रविदाम् (mantravidām) - of those who know mantras (mantra), among the mantra-knowers

• श्रेष्ठः (śreṣṭhaḥ) - best, most excellent, foremost

• सृष्ट्वा (sṛṣṭvā) - having created, having produced

• मन्त्रः (mantraḥ) - mantra (sacred utterance), counsel

• व्यचेष्टयत् (vyaceṣṭayat) - he set in motion, he agitated, he caused to move

Words meanings and morphology

विदूरथः (vidūrathaḥ) - Vidūratha (a proper name)

(proper noun)

Nominative, masculine, singular of vidūratha

vidūratha - name of a king, Vidūratha

अथ (atha) - then, now, therefore

(indeclinable)

मार्तण्डम् (mārtaṇḍam) - the sun

(noun)

Accusative, masculine, singular of mārtaṇḍa

mārtaṇḍa - the sun, a sun-god; name of a deity

दीपम् (dīpam) - lamp, light

(noun)

Accusative, masculine, singular of dīpa

dīpa - lamp, light, anything that illumines

ब्रह्माण्डमण्डपे (brahmāṇḍamaṇḍape) - in the pavilion of the universe

(noun)

Locative, masculine, singular of brahmāṇḍamaṇḍapa

brahmāṇḍamaṇḍapa - the pavilion of the universe

Compound type : tatpuruṣa (brahmāṇḍa+maṇḍapa)

• brahmāṇḍa – the egg of Brahmā, the universe, cosmos
  noun (neuter)
• maṇḍapa – pavilion, open hall, canopy
  noun (masculine)

अस्त्रम् (astram) - weapon, missile

(noun)

Accusative, neuter, singular of astra

astra - a missile, dart, arrow; a weapon (generally)

मन्त्रविदाम् (mantravidām) - of those who know mantras (mantra), among the mantra-knowers

(noun)

Genitive, masculine, plural of mantravid

mantravid - knower of sacred formulas (mantra)

Compound type : tatpuruṣa (mantra+vid)

• mantra – sacred utterance, hymn, incantation, counsel
  noun (masculine)
• vid – knower, understanding
  noun (masculine)

श्रेष्ठः (śreṣṭhaḥ) - best, most excellent, foremost

(adjective)

Nominative, masculine, singular of śreṣṭha

śreṣṭha - best, most excellent, superior, chief

सृष्ट्वा (sṛṣṭvā) - having created, having produced

(indeclinable)

Absolutive (Gerund)

Derived from root sṛj-

Root: sṛj (class 6)

मन्त्रः (mantraḥ) - mantra (sacred utterance), counsel

(noun)

Nominative, masculine, singular of mantra

mantra - sacred utterance, hymn, incantation, counsel, plan

Root: man (class 4)

Note: Used here effectively as an accusative due to poetic license or context, as the object of 'having created'.

व्यचेष्टयत् (vyaceṣṭayat) - he set in motion, he agitated, he caused to move

(verb)

3rd person , singular, active, past imperfect (laṅ) of ceṣṭ

Causative of root ceṣṭ- with prefix vi-

Prefix: vi

Root: ceṣṭ (class 1)