महाभारतः mahābhārataḥ - book-6, chapter-16, verse-39

एकादशी धार्तराष्ट्री कौरवाणां महाचमूः ।
अग्रतः सर्वसैन्यानां यत्र शांतनवोऽग्रणीः ॥३९॥

39. ekādaśī dhārtarāṣṭrī kauravāṇāṁ mahācamūḥ ,
agrataḥ sarvasainyānāṁ yatra śāṁtanavo'graṇīḥ.

39. ekādaśī dhārtarāṣṭrī kauravāṇām mahācamūḥ
agrataḥ sarvasainyānām yatra śāṃtanavaḥ agraṇīḥ

39. kauravāṇām dhārtarāṣṭrī ekādaśī mahācamūḥ
yatra śāṃtanavaḥ agraṇīḥ sarvasainyānām agrataḥ

39. The eleventh great army, Dhṛtarāṣṭra's (dhārtarāṣṭrī), belonging to the Kauravas, was positioned at the forefront of all the armies, with Bhīṣma (śāṃtanava), the son of Śantanu, as its leader.

Words meanings summery:

• एकादशी (ekādaśī) - eleventh

• धार्तराष्ट्री (dhārtarāṣṭrī) - belonging to Dhṛtarāṣṭra (i.e., part of the Kaurava forces) (belonging to Dhṛtarāṣṭra, Dhṛtarāṣṭra's)

• कौरवाणाम् (kauravāṇām) - of the Kauravas

• महाचमूः (mahācamūḥ) - great army (great army, vast host)

• अग्रतः (agrataḥ) - at the forefront of (in front of, at the head of, before)

• सर्वसैन्यानाम् (sarvasainyānām) - of all the armies (of all armies, of all forces)

• यत्र (yatra) - where (where, in which, whenever)

• शांतनवः (śāṁtanavaḥ) - Bhīṣma, the son of Śantanu (son of Śantanu, Bhīṣma)

• अग्रणीः (agraṇīḥ) - leader (leader, chief, foremost)

Words meanings and morphology

एकादशी (ekādaśī) - eleventh

(adjective)

Nominative, feminine, singular of ekādaśa

ekādaśa - eleventh

From eka (one) + daśa (ten)

धार्तराष्ट्री (dhārtarāṣṭrī) - belonging to Dhṛtarāṣṭra (i.e., part of the Kaurava forces) (belonging to Dhṛtarāṣṭra, Dhṛtarāṣṭra's)

(adjective)

Nominative, feminine, singular of dhārtarāṣṭra

dhārtarāṣṭra - descendant of Dhṛtarāṣṭra, relating to Dhṛtarāṣṭra

Taddhita derivation from Dhṛtarāṣṭra

कौरवाणाम् (kauravāṇām) - of the Kauravas

(noun)

Genitive, masculine, plural of kaurava

kaurava - descendant of Kuru, belonging to the Kuru dynasty, Kaurava

Taddhita derivation from Kuru

महाचमूः (mahācamūḥ) - great army (great army, vast host)

(noun)

Nominative, feminine, singular of mahācamū

mahācamū - great army, large force

Compound type : karmadhāraya (mahā+camū)

• mahā – great, large, extensive
  adjective (feminine)
• camū – army, host, troop
  noun (feminine)

अग्रतः (agrataḥ) - at the forefront of (in front of, at the head of, before)

(indeclinable)

From agra + suffix -tas

सर्वसैन्यानाम् (sarvasainyānām) - of all the armies (of all armies, of all forces)

(noun)

Genitive, neuter, plural of sarvasainya

sarvasainya - all armies, all forces

Compound type : karmadhāraya (sarva+sainya)

• sarva – all, every, whole
  pronoun/adjective (masculine)
• sainya – army, host, forces
  noun (neuter)

यत्र (yatra) - where (where, in which, whenever)

(indeclinable)

Adverb of place

शांतनवः (śāṁtanavaḥ) - Bhīṣma, the son of Śantanu (son of Śantanu, Bhīṣma)

(proper noun)

Nominative, masculine, singular of śāṃtanava

śāṁtanava - son of Śantanu (a name for Bhīṣma)

Patronymic derivation from Śantanu

अग्रणीः (agraṇīḥ) - leader (leader, chief, foremost)

(noun)

Nominative, masculine, singular of agraṇī

agraṇī - leader, chief, foremost, guide

From agra (front) + √nī (to lead)

Root: nī (class 1)