महाभारतः mahābhārataḥ - book-9, chapter-44, verse-44

स्थिरं चातिस्थिरं चैव मेरुरेवापरौ ददौ ।
महात्मनेऽग्निपुत्राय महाबलपराक्रमौ ॥४४॥

44. sthiraṁ cātisthiraṁ caiva merurevāparau dadau ,
mahātmane'gniputrāya mahābalaparākramau.

44. sthiram ca atisthiram ca eva meruḥ eva aparau
dadau mahātmane agniputrāya mahābalaparākramau

44. meruḥ eva mahātmane agniputrāya sthiram ca
atisthiram ca eva mahābalaparākramau aparau dadau

44. And Mount Meru indeed gave two other attendants, Sthira and Atisthira, who possessed great strength and valor, to the great-souled (mahātman) son of Agni.

Words meanings summery:

• स्थिरम् (sthiram) - Sthira (proper name of an attendant) (firm, steady, constant; the firm one)

• च (ca) - and, also

• अतिस्थिरम् (atisthiram) - Atisthira (proper name of an attendant) (exceedingly firm, very steady; the very firm one)

• च (ca) - and, also

• एव (eva) - only, just, indeed, certainly

• मेरुः (meruḥ) - Mount Meru

• एव (eva) - only, just, indeed, certainly

• अपरौ (aparau) - Sthira and Atisthira as two other attendants (two others, two more)

• ददौ (dadau) - he gave, bestowed, offered

• महात्मने (mahātmane) - to the great-souled son of Agni (to the great-souled one, to the noble one)

• अग्निपुत्राय (agniputrāya) - to the son of Agni

• महाबलपराक्रमौ (mahābalaparākramau) - referring to Sthira and Atisthira (of great strength and valor, having great might and prowess)

Words meanings and morphology

स्थिरम् (sthiram) - Sthira (proper name of an attendant) (firm, steady, constant; the firm one)

(adjective)

Accusative, masculine, singular of sthira

sthira - firm, steady, constant, immovable, stable

Root: sthā (class 1)

च (ca) - and, also

(indeclinable)

अतिस्थिरम् (atisthiram) - Atisthira (proper name of an attendant) (exceedingly firm, very steady; the very firm one)

(adjective)

Accusative, masculine, singular of atisthira

atisthira - exceedingly firm, very steady, highly stable

Compound type : prādi-samāsa (ati+sthira)

• ati – over, beyond, exceeding, very
  indeclinable
• sthira – firm, steady, constant, immovable, stable
  adjective (masculine)
  Root: sthā (class 1)

च (ca) - and, also

(indeclinable)

एव (eva) - only, just, indeed, certainly

(indeclinable)

मेरुः (meruḥ) - Mount Meru

(proper noun)

Nominative, masculine, singular of meru

meru - Meru, a mythical sacred mountain, considered to be the center of the universe

एव (eva) - only, just, indeed, certainly

(indeclinable)

अपरौ (aparau) - Sthira and Atisthira as two other attendants (two others, two more)

(pronoun)

Accusative, masculine, dual of apara

apara - other, another, posterior, subsequent

ददौ (dadau) - he gave, bestowed, offered

(verb)

3rd person , singular, active, perfect (Lit) of dā

Root: dā (class 3)

महात्मने (mahātmane) - to the great-souled son of Agni (to the great-souled one, to the noble one)

(noun)

Dative, masculine, singular of mahātman

mahātman - great-souled, noble, magnanimous; a great person; the supreme (ātman)

Compound type : karmadhāraya (mahā+ātman)

• mahā – great, large, mighty
  adjective
• ātman – self, soul, spirit, individual essence, consciousness
  noun (masculine)

अग्निपुत्राय (agniputrāya) - to the son of Agni

(noun)

Dative, masculine, singular of agniputra

agniputra - son of Agni (the fire god)

Compound type : tatpuruṣa (agni+putra)

• agni – fire; the fire god
  noun (masculine)
• putra – son, offspring
  noun (masculine)

महाबलपराक्रमौ (mahābalaparākramau) - referring to Sthira and Atisthira (of great strength and valor, having great might and prowess)

(adjective)

Accusative, masculine, dual of mahābalaparākrama

mahābalaparākrama - great strength and valor, great might and prowess

Compound type : dvandva-garbha tatpuruṣa (mahā+bala+parākrama)

• mahā – great, large, mighty
  adjective
• bala – strength, power, force
  noun (neuter)
• parākrama – valor, prowess, heroism, might
  noun (masculine)