महाभारतः mahābhārataḥ - book-7, chapter-33, verse-18

प्रमुखे तस्य सैन्यस्य द्रोणोऽवस्थितनायके ।
सिन्धुराजस्तथातिष्ठच्छ्रीमान्मेरुरिवाचलः ॥१८॥

18. pramukhe tasya sainyasya droṇo'vasthitanāyake ,
sindhurājastathātiṣṭhacchrīmānmerurivācalaḥ.

18. pramukhe tasya sainyasya droṇaḥ avasthitanāyake
sindhurājaḥ tathā atiṣṭhat śrīmān meruḥ iva acalaḥ

18. tasya sainyasya pramukhe droṇaḥ avasthitanāyake
tathā śrīmān sindhurājaḥ meruḥ iva acalaḥ atiṣṭhat

18. In the vanguard of that army, Droṇa stood as its commander. Likewise, the glorious King of Sindhu (Jayadratha), like an immovable Mount Meru, stood firm.

Words meanings summery:

• प्रमुखे (pramukhe) - in the front, in the vanguard, at the head

• तस्य (tasya) - of that, its

• सैन्यस्य (sainyasya) - of the army, of the host

• द्रोणः (droṇaḥ) - Droṇācārya, the royal guru and commander of the Kaurava army. (Droṇa (proper name))

• अवस्थितनायके (avasthitanāyake) - as a standing leader, as an established commander

• सिन्धुराजः (sindhurājaḥ) - Jayadratha, the King of Sindhu. (king of Sindhu)

• तथा (tathā) - thus, so, likewise

• अतिष्ठत् (atiṣṭhat) - he stood, he remained

• श्रीमान् (śrīmān) - glorious, splendid, prosperous

• मेरुः (meruḥ) - Mount Meru (mythical mountain)

• इव (iva) - like, as, as if

• अचलः (acalaḥ) - immovable, steady; mountain

Words meanings and morphology

प्रमुखे (pramukhe) - in the front, in the vanguard, at the head

(noun)

Locative, masculine, singular of pramukha

pramukha - front, chief, leading

Prefix: pra

Root: mukh

Note: Refers to the position.

तस्य (tasya) - of that, its

(pronoun)

Genitive, neuter, singular of tad

tad - that, those

Note: Refers to 'sainyasya'.

सैन्यस्य (sainyasya) - of the army, of the host

(noun)

Genitive, neuter, singular of sainya

sainya - army, host, military force

Derived from senā (army).

Note: Qualifies 'pramukhe'.

द्रोणः (droṇaḥ) - Droṇācārya, the royal guru and commander of the Kaurava army. (Droṇa (proper name))

(proper noun)

Nominative, masculine, singular of droṇa

droṇa - Droṇa (proper name, warrior-teacher in Mahabharata)

Root: dru

Note: Subject.

अवस्थितनायके (avasthitanāyake) - as a standing leader, as an established commander

(noun)

Locative, masculine, singular of avasthitanāyaka

avasthitanāyaka - established leader, fixed commander

Compound type : karmadhāraya (avasthita+nāyaka)

• avasthita – standing, situated, established
  adjective (masculine)
  Past Passive Participle
  From verb ava-sthā (to stand, remain)
  Prefix: ava
  Root: sthā (class 1)
• nāyaka – leader, guide, commander
  noun (masculine)
  From root nī (to lead)
  Root: nī (class 1)

Note: The locative indicates 'in the capacity of'.

सिन्धुराजः (sindhurājaḥ) - Jayadratha, the King of Sindhu. (king of Sindhu)

(proper noun)

Nominative, masculine, singular of sindhurāja

sindhurāja - king of Sindhu (region), Jayadratha

Compound type : tatpurusha (sindhu+rāja)

• sindhu – Sindhu (Indus river, or the region around it)
  proper noun (masculine)
  Root: syand
• rāja – king, ruler
  noun (masculine)
  shortened form of rājan in compound
  Root: rāj

Note: Subject of the second clause.

तथा (tathā) - thus, so, likewise

(indeclinable)

अतिष्ठत् (atiṣṭhat) - he stood, he remained

(verb)

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

Imperfect active 3rd singular

Root: sthā (class 1)

Note: Predicate for 'sindhurājaḥ' and implicitly for 'droṇaḥ'.

श्रीमान् (śrīmān) - glorious, splendid, prosperous

(adjective)

Nominative, masculine, singular of śrīmat

śrīmat - glorious, splendid, possessing wealth/fortune

Possessive suffix matup from śrī.

Note: Agrees with 'sindhurājaḥ'.

मेरुः (meruḥ) - Mount Meru (mythical mountain)

(proper noun)

Nominative, masculine, singular of meru

meru - Meru (name of a mythical golden mountain, central to the universe)

Note: Object of comparison with 'sindhurājaḥ'.

इव (iva) - like, as, as if

(indeclinable)

अचलः (acalaḥ) - immovable, steady; mountain

(adjective)

Nominative, masculine, singular of acala

acala - immovable, stationary; mountain

Negation of cala (moving).

Compound type : nañ-tatpuruṣa (a+cala)

• a – not, un-
  indeclinable
  Negative prefix
• cala – moving, trembling, fickle
  adjective
  From root cal (to move)
  Root: cal (class 1)

Note: Agrees with 'meruḥ'.