वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-5, chapter-46, verse-38

ततः स्वायम्भुवैर्मन्त्रैर्ब्रह्मास्त्रमभिमन्त्रितम् ।
हनूमांश्चिन्तयामास वरदानं पितामहात् ॥३८॥

38. tataḥ svāyambhuvairmantrairbrahmāstramabhimantritam ,
hanūmāṃścintayāmāsa varadānaṃ pitāmahāt.

38. tataḥ svāyambhuvaiḥ mantraiḥ brahmāstram
abhimantritam hanūmān cintayāmāsa varadānam pitāmahāt

38. tataḥ hanūmān svāyambhuvaiḥ mantraiḥ abhimantritam
brahmāstram pitāmahāt varadānam cintayāmāsa

38. Then, (realizing that) the Brahmāstra (a mystic weapon) had been consecrated with self-generated Vedic incantations (mantra), Hanuman pondered the boon he had received from his grandfather, Brahmā (Pitāmaha).

Words meanings summery:

• ततः (tataḥ) - then, subsequently (then, thereafter, from there)

• स्वायम्भुवैः (svāyambhuvaiḥ) - by the mantras of Brahmā (Svayambhū) (by those relating to Svayambhū (Brahmā), self-existent)

• मन्त्रैः (mantraiḥ) - by the specific Vedic incantations used to activate the Brahmāstra (by means of sacred verses, by mantras, by incantations)

• ब्रह्मास्त्रम् (brahmāstram) - the specific mystic weapon (astra) invoked by Indrajit (the Brahmāstra (weapon of Brahmā))

• अभिमन्त्रितम् (abhimantritam) - consecrated (with the power of mantras) (consecrated, invoked, imbued with mantras)

• हनूमान् (hanūmān) - Hanuman, the monkey general (Hanuman)

• चिन्तयामास (cintayāmāsa) - he reflected upon (he pondered, he reflected, he thought)

• वरदानम् (varadānam) - the boon granted to him (by Brahmā), making him invulnerable to certain weapons. (boon, granting of a wish, gift)

• पितामहात् (pitāmahāt) - from Lord Brahmā (from the paternal grandfather, from Brahmā)

Words meanings and morphology

ततः (tataḥ) - then, subsequently (then, thereafter, from there)

(indeclinable)

From `tad` + suffix -tas.

स्वायम्भुवैः (svāyambhuvaiḥ) - by the mantras of Brahmā (Svayambhū) (by those relating to Svayambhū (Brahmā), self-existent)

(adjective)

Instrumental, masculine, plural of svāyambhuva

svāyambhuva - relating to Svayambhū (Brahmā), self-existent, self-manifested

Derived from `svayambhū` (self-existent, a name for Brahmā).

Root: bhū (class 1)

मन्त्रैः (mantraiḥ) - by the specific Vedic incantations used to activate the Brahmāstra (by means of sacred verses, by mantras, by incantations)

(noun)

Instrumental, masculine, plural of mantra

mantra - sacred verse, hymn, incantation, counsel

From root `man` (to think) + suffix `-tra`.

Root: man (class 4)

ब्रह्मास्त्रम् (brahmāstram) - the specific mystic weapon (astra) invoked by Indrajit (the Brahmāstra (weapon of Brahmā))

(proper noun)

Nominative, neuter, singular of brahmāstra

brahmāstra - the weapon of Brahmā

Compound of `brahman` (Brahmā) + `astra` (weapon).

Compound type : tatpuruṣa (brahman+astra)

• brahman – Brahmā (the creator god), sacred utterance, the Absolute
  proper noun (masculine)
• astra – weapon, missile, mystic weapon
  noun (neuter)
  Root: as (class 4)

Note: This is the object of the implied understanding.

अभिमन्त्रितम् (abhimantritam) - consecrated (with the power of mantras) (consecrated, invoked, imbued with mantras)

(adjective)

Nominative, neuter, singular of abhimantrita

abhimantrita - consecrated, charmed, invoked, imbued with mantras

Past Passive Participle

From `abhi-` + root `mantr` (to consult, charm) with suffix `-ita`.

Prefix: abhi

Root: mantr (class 10)

Note: Used predicatively; implies 'was consecrated'.

हनूमान् (hanūmān) - Hanuman, the monkey general (Hanuman)

(proper noun)

Nominative, masculine, singular of hanūmat

hanūmat - Hanuman (literally 'having a prominent jaw')

Possessive suffix `-mat` from `hanu` (jaw).

चिन्तयामास (cintayāmāsa) - he reflected upon (he pondered, he reflected, he thought)

(verb)

3rd person , singular, active, perfect (liṭ) of cintay

Periphrastic Perfect (Liṭ), 3rd person singular. Formed with secondary root `cintay` (causative of `cit`) and `āmāsa` (perfect of `as` with `ām`).

Root: cit (class 1)

वरदानम् (varadānam) - the boon granted to him (by Brahmā), making him invulnerable to certain weapons. (boon, granting of a wish, gift)

(noun)

Accusative, neuter, singular of varadāna

varadāna - granting of a boon, gift, a boon

Compound of `vara` (boon, wish) + `dāna` (giving, gift).

Compound type : tatpuruṣa (vara+dāna)

• vara – boon, wish, blessing
  noun (masculine)
  Root: vṛ (class 1)
• dāna – giving, gift, donation
  noun (neuter)
  From root `dā` (to give).
  Root: dā (class 3)

पितामहात् (pitāmahāt) - from Lord Brahmā (from the paternal grandfather, from Brahmā)

(proper noun)

Ablative, masculine, singular of pitāmaha

pitāmaha - paternal grandfather, Lord Brahmā

Compound: `pitṛ` (father) + `mahant` (great).

Compound type : karmadhāraya (pitṛ+mahant)

• pitṛ – father
  noun (masculine)
• mahant – great, large
  adjective

Note: Source of the boon.