महाभारतः mahābhārataḥ - book-1, chapter-188, verse-15

गुरोश्च वचनं प्राहुर्धर्मं धर्मज्ञसत्तम ।
गुरूणां चैव सर्वेषां जनित्री परमो गुरुः ॥१५॥

15. gurośca vacanaṁ prāhurdharmaṁ dharmajñasattama ,
gurūṇāṁ caiva sarveṣāṁ janitrī paramo guruḥ.

15. guroḥ ca vacanam prāhuḥ dharmam dharmajñasattama
gurūṇām ca eva sarveṣām janitrī paramaḥ guruḥ

15. And, O best among those who know (dharma), they declare the word of the (guru) to be (dharma). Indeed, among all (gurus), the mother is the supreme (guru).

Words meanings summery:

• गुरोः (guroḥ) - of the (guru), from the (guru)

• च (ca) - and

• वचनम् (vacanam) - word, speech, command

• प्राहुः (prāhuḥ) - they say, they declare

• धर्मम् (dharmam) - (dharma), righteousness, duty

• धर्मज्ञसत्तम (dharmajñasattama) - Vocative address to a wise person, like Vyāsa or the Brahmins. (O best among those who know (dharma))

• गुरूणाम् (gurūṇām) - of the (gurus)

• च (ca) - and

• एव (eva) - indeed, certainly, only

• सर्वेषाम् (sarveṣām) - of all

• जनित्री (janitrī) - mother

• परमः (paramaḥ) - supreme, highest, best

• गुरुः (guruḥ) - teacher, spiritual preceptor (guru)

Words meanings and morphology

गुरोः (guroḥ) - of the (guru), from the (guru)

(noun)

Genitive, masculine, singular of guru

guru - teacher, spiritual preceptor, venerable person (guru)

च (ca) - and

(indeclinable)

वचनम् (vacanam) - word, speech, command

(noun)

Accusative, neuter, singular of vacana

vacana - speaking, saying, word, speech, command

प्राहुः (prāhuḥ) - they say, they declare

(verb)

3rd person , plural, active, past perfect (liṭ) of pra-ah

Perfect Active

3rd person plural perfect, from pra + ah (perfect form of root brū/vac)

Prefix: pra

Root: ah (class 2)

धर्मम् (dharmam) - (dharma), righteousness, duty

(noun)

Accusative, masculine, singular of dharma

dharma - constitution, natural law, intrinsic nature, righteousness, duty (dharma)

धर्मज्ञसत्तम (dharmajñasattama) - Vocative address to a wise person, like Vyāsa or the Brahmins. (O best among those who know (dharma))

(adjective)

Vocative, masculine, singular of dharmajñasattama

dharmajñasattama - best among those who know (dharma)

Compound type : tatpuruṣa (dharmajña+sattama)

• dharmajña – one who knows (dharma)
  adjective (masculine)
• sattama – best, excellent, highest
  adjective (masculine)
  Superlative suffix -tama.

गुरूणाम् (gurūṇām) - of the (gurus)

(noun)

Genitive, masculine, plural of guru

guru - teacher, spiritual preceptor, venerable person (guru)

च (ca) - and

(indeclinable)

एव (eva) - indeed, certainly, only

(indeclinable)

सर्वेषाम् (sarveṣām) - of all

(pronoun)

Genitive, masculine, plural of sarva

sarva - all, every, whole

Note: Qualifies `gurūṇām`.

जनित्री (janitrī) - mother

(noun)

Nominative, feminine, singular of janitrī

janitrī - mother, producer

परमः (paramaḥ) - supreme, highest, best

(adjective)

Nominative, masculine, singular of parama

parama - supreme, highest, best, ultimate

Note: Qualifies `guruḥ`.

गुरुः (guruḥ) - teacher, spiritual preceptor (guru)

(noun)

Nominative, masculine, singular of guru

guru - teacher, spiritual preceptor, venerable person (guru)