V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry भ्रातृ
भ्रातृbhrātṛm.A brother.
[भ्राज्-तृच् पृषोdenotes that the rest of the word under consideration is to be supplied; Compare Uṇ.2.96.]
A brother.
An intimate friend or relation.
A near relative in general.
A term of friendly address (my good friend); भ्रातः कष्टमहो Bh.3.37;2.34; तत्त्वं चिन्तय तदिदं भ्रातः Moha M.3. -Dual. A brother and sister. CompareLatin frater; Zend bratar, English brother.-Compound
Derived forms and compounds
-गन्धि, -गन्धिकAdjective having only the name of a brother, a brother in mere name.
-गन्धिकः, -गन्धिन्Masculine a brother in mere name; गत्वा चाह्वय सुग्रीव वालिनं भ्रातृगन्धिनम् Rām.4.12.13.
-जः a brother's son.
-जाया (also भ्रातुर्जाया) a brother's wife, a sister-in-law; अव्यापन्नामविहतगतिर्द्रक्ष्यसि भ्रातृजायाम् Me.1.
-दत्तम् property given by a brother to a sister at the time of her marriage; मातृकं भ्रातृदत्तं वा स्तेना स्याद्यदि तं हरेत् Ms.9.92.
-द्वितीया the second day of the bright half of Kārtika (when sisters invite their brothers to their houses and entertain them, who in their turn give them presents; the day seems to have been so called on account of Yamunā having entertained her brother Yama on that day; Compareयमद्वितीया).
-पुत्रः (also भ्रातुष्पुत्रः) a brother's son. (-त्री) a niece.
tatrāpaśyatsthitānpārthaḥ pitÔnatha pitāmahān, — Then saw Partha standing upon opposite sides, uncles and grandsires, teachers, mother’s brothers, cousins, sons and grandsons, comrades… 1·26
भ्रातृन्bhrātṛnaccusative plural of the masculine noun bhrātṛ (brother).