Abbott-Smith Manual Greek Lexicon
ἀδελφή (G79)
26 ἀδελφή , -ῆς, ἡ ( ἀδελφός ), [in LXX for אָחוֹת ;] a sister : Mt 19:29 , al.; metaph. (MM, VGT , s.v.), of a member of the Christian community: Ro 16:1 , I Co 7:15 Ja 21:15 , al.
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain