महाभारतः mahābhārataḥ - book-3, chapter-163, verse-42

अदृश्यत ततः साक्षाद्भगवान्गोवृषध्वजः ।
उमासहायो हरिदृग्बहुरूपः पिनाकधृक् ॥४२॥

42. adṛśyata tataḥ sākṣādbhagavāngovṛṣadhvajaḥ ,
umāsahāyo haridṛgbahurūpaḥ pinākadhṛk.

42. adṛśyata tataḥ sākṣāt bhagavān govṛṣadhvajaḥ
umāsahāyaḥ haridṛk bahurūpaḥ pinākadhṛk

42. Then, the divine Lord whose banner is a bull, accompanied by Uma, possessing Vishnu's eye, appearing in many forms, and wielding the Pinaka bow, was directly seen.

Words meanings summery:

• अदृश्यत (adṛśyata) - was seen, appeared

• ततः (tataḥ) - then (then, from there, therefore)

• साक्षात् (sākṣāt) - directly (directly, in person, visibly)

• भगवान् (bhagavān) - the divine Lord (referring to Shiva) (divine, blessed, revered lord)

• गोवृषध्वजः (govṛṣadhvajaḥ) - one whose banner is a bull (an epithet of Shiva) (one whose banner is a bull)

• उमासहायः (umāsahāyaḥ) - accompanied by Uma (Parvati) (accompanied by Uma, having Uma as a companion)

• हरिदृक् (haridṛk) - possessing Vishnu's eye (referring to Shiva's divine third eye) (having Vishnu's eye, with a captivating gaze)

• बहुरूपः (bahurūpaḥ) - appearing in many forms (many-formed, multifaceted, polymorphous)

• पिनाकधृक् (pinākadhṛk) - wielding the Pinaka bow (an epithet of Shiva) (wielder of the Pinaka bow, holder of Pinaka)

Words meanings and morphology

अदृश्यत (adṛśyata) - was seen, appeared

(verb)

3rd person , singular, passive, imperfect (laṅ) of dṛś

Imperfect tense, passive voice, 3rd person singular

From root dṛś, Imperfect passive, atmanepada.

Root: dṛś (class 1)

ततः (tataḥ) - then (then, from there, therefore)

(indeclinable)

Adverbial derivative from 'tad' (that).

साक्षात् (sākṣāt) - directly (directly, in person, visibly)

(indeclinable)

Adverb.

भगवान् (bhagavān) - the divine Lord (referring to Shiva) (divine, blessed, revered lord)

(adjective)

Nominative, masculine, singular of bhagavat

bhagavat - divine, blessed, prosperous, revered lord

Present active participle of root 'bhaj' (to possess, to enjoy), used as a noun meaning 'Lord'.

Root: bhaj (class 1)

गोवृषध्वजः (govṛṣadhvajaḥ) - one whose banner is a bull (an epithet of Shiva) (one whose banner is a bull)

(adjective)

Nominative, masculine, singular of govṛṣadhvaja

govṛṣadhvaja - one whose banner is a bull

Compound type : bahuvrīhi (go+vṛṣa+dhvaja)

• go – bull, cow, earth, speech
  noun (masculine)
• vṛṣa – bull, masculinity, rain
  noun (masculine)
• dhvaja – banner, flag, emblem
  noun (masculine)

उमासहायः (umāsahāyaḥ) - accompanied by Uma (Parvati) (accompanied by Uma, having Uma as a companion)

(adjective)

Nominative, masculine, singular of umāsahāya

umāsahāya - accompanied by Uma

Compound type : bahuvrīhi (umā+sahāya)

• umā – Uma (name of Parvati)
  proper noun (feminine)
• sahāya – companion, helper, aid
  noun (masculine)

हरिदृक् (haridṛk) - possessing Vishnu's eye (referring to Shiva's divine third eye) (having Vishnu's eye, with a captivating gaze)

(adjective)

Nominative, masculine, singular of haridṛś

haridṛś - having green eyes, having Vishnu's eye, having a captivating gaze

Compound type : bahuvrīhi (hari+dṛś)

• hari – Vishnu, green, yellowish, lion
  proper noun (masculine)
• dṛś – eye, sight, appearance
  noun (feminine)
  From root dṛś 'to see'.
  Root: dṛś (class 1)

Note: This is a compound often understood as referring to Shiva's third eye or his all-seeing nature, sometimes specifically linking it to Vishnu's power.

बहुरूपः (bahurūpaḥ) - appearing in many forms (many-formed, multifaceted, polymorphous)

(adjective)

Nominative, masculine, singular of bahurūpa

bahurūpa - many-formed, multifarious, polymorphous

Compound type : bahuvrīhi (bahu+rūpa)

• bahu – many, much, abundant
  adjective
• rūpa – form, shape, appearance, beauty
  noun (neuter)

पिनाकधृक् (pinākadhṛk) - wielding the Pinaka bow (an epithet of Shiva) (wielder of the Pinaka bow, holder of Pinaka)

(adjective)

Nominative, masculine, singular of pinākadhṛk

pinākadhṛk - wielder of the Pinaka bow

Compound type : tatpuruṣa (pināka+dhṛ)

• pināka – Pinaka (Shiva's bow)
  proper noun (masculine)
• dhṛ – holder, bearer, upholder
  noun (masculine)
  From root dhṛ (to hold, bear).
  Root: dhṛ (class 1)

Note: This is an agent noun (dhṛk from dhṛ + kvip), treated as adjective here.