महाभारतः mahābhārataḥ - book-3, chapter-18, verse-7

जलेचरः काञ्चनयष्टिसंस्थो व्यात्ताननः सर्वतिमिप्रमाथी ।
वित्रासयन्राजति वाहमुख्ये शाल्वस्य सेनाप्रमुखे ध्वजाग्र्यः ॥७॥

7. jalecaraḥ kāñcanayaṣṭisaṁstho; vyāttānanaḥ sarvatimipramāthī ,
vitrāsayanrājati vāhamukhye; śālvasya senāpramukhe dhvajāgryaḥ.

7. jale-caraḥ kāñcanayaṣṭi-saṃsthaḥ
vyātta-ānanaḥ sarva-timi-pramāthī
vi-trāsayan rājati vāha-mukhye
śālvasya senā-pramukhe dhvaja-agryaḥ

7. At the forefront of Śālva's army, on his main vehicle, a magnificent banner prominently displayed an aquatic creature. This emblem, fixed to a golden staff, had its mouth wide open, terrifying all as if it were the destroyer of all mighty sea creatures.

Words meanings summery:

• जले-चरः (jale-caraḥ) - moving in water, aquatic creature

• काञ्चनयष्टि-संस्थः (kāñcanayaṣṭi-saṁsthaḥ) - situated on a golden staff

• व्यात्त-आननः (vyātta-ānanaḥ) - with an open mouth

• सर्व-तिमि-प्रमाथी (sarva-timi-pramāthī) - destroyer of all mighty sea creatures/whales

• वि-त्रासयन् (vi-trāsayan) - frightening, causing terror

• राजति (rājati) - shines, appears prominently, is prominent

• वाह-मुख्ये (vāha-mukhye) - on the principal vehicle

• शाल्वस्य (śālvasya) - of Śālva

• सेना-प्रमुखे (senā-pramukhe) - at the forefront of the army

• ध्वज-अग्र्यः (dhvaja-agryaḥ) - the excellent/foremost banner

Words meanings and morphology

जले-चरः (jale-caraḥ) - moving in water, aquatic creature

(noun)

Nominative, masculine, singular of jalecara

jalecara - aquatic creature, water-dweller

Compound type : tatpuruṣa (jala+cara)

• jala – water
  noun (neuter)
• cara – moving, going, a mover
  adjective (masculine)
  Derived from root car (to move) with suffix aṉ
  Root: car (class 1)

काञ्चनयष्टि-संस्थः (kāñcanayaṣṭi-saṁsthaḥ) - situated on a golden staff

(adjective)

Nominative, masculine, singular of kāñcanayaṣṭisaṃstha

kāñcanayaṣṭisaṁstha - one situated/placed on a golden staff

Compound type : tatpuruṣa (kāñcana+yaṣṭi+saṃstha)

• kāñcana – golden, made of gold
  adjective (neuter)
• yaṣṭi – staff, stick, pole
  noun (feminine)
• saṃstha – situated, placed, standing in/on
  adjective (masculine)
  Derived from root sthā with prefix sam
  Prefix: sam
  Root: sthā (class 1)

व्यात्त-आननः (vyātta-ānanaḥ) - with an open mouth

(adjective)

Nominative, masculine, singular of vyāttānana

vyāttānana - one with an open mouth

Compound type : bahuvrīhi (vyātta+ānana)

• vyātta – opened, wide open
  adjective (neuter)
  Past Passive Participle
  Past passive participle of root yam with prefixes vi and ā
  Prefixes: vi+ā
  Root: yam (class 1)
• ānana – mouth, face
  noun (neuter)

सर्व-तिमि-प्रमाथी (sarva-timi-pramāthī) - destroyer of all mighty sea creatures/whales

(noun)

Nominative, masculine, singular of sarvatimipramāthin

sarvatimipramāthin - one who destroys all whales/large fish

Compound type : tatpuruṣa (sarva+timi+pramāthin)

• sarva – all, every
  pronoun (masculine)
• timi – whale, large fish, sea monster
  noun (masculine)
• pramāthin – destroyer, annihilator, tormentor
  noun (masculine)
  Agent noun from root math/manth with prefix pra
  Prefix: pra
  Root: math (class 1)

वि-त्रासयन् (vi-trāsayan) - frightening, causing terror

(adjective)

Nominative, masculine, singular of vitrāsant

vitrāsant - frightening, terrifying

Present Active Participle (causative)

Present participle of the causative verb vitrāsayati (from root tras with prefix vi)

Prefix: vi

Root: tras (class 4)

राजति (rājati) - shines, appears prominently, is prominent

(verb)

3rd person , singular, active, present indicative (laṭ) of rāj

Root: rāj (class 1)

वाह-मुख्ये (vāha-mukhye) - on the principal vehicle

(noun)

Locative, neuter, singular of vāhamukhya

vāhamukhya - chief vehicle, main conveyance

Compound type : tatpuruṣa (vāha+mukhya)

• vāha – vehicle, carriage, carrying
  noun (masculine)
  Root: vah (class 1)
• mukhya – chief, principal, foremost
  adjective (masculine)

शाल्वस्य (śālvasya) - of Śālva

(proper noun)

Genitive, masculine, singular of śālva

śālva - Śālva (name of a king, enemy of Kṛṣṇa)

सेना-प्रमुखे (senā-pramukhe) - at the forefront of the army

(noun)

Locative, masculine, singular of senāpramukha

senāpramukha - front of the army, vanguard

Compound type : tatpuruṣa (senā+pramukha)

• senā – army, host
  noun (feminine)
• pramukha – front, chief, leader
  noun (masculine)
  Prefix: pra

ध्वज-अग्र्यः (dhvaja-agryaḥ) - the excellent/foremost banner

(noun)

Nominative, masculine, singular of dhvajāgrya

dhvajāgrya - chief banner, excellent flag, leading standard

Compound type : tatpuruṣa (dhvaja+agrya)

• dhvaja – banner, flag, standard
  noun (masculine)
• agrya – foremost, excellent, chief
  adjective (masculine)