LSJ
contr. -οῦς, ὁ, nephew, Alcm. 56A, etc. ; usu.
brother΄s son, Hdt. 1.65, 6.94, al., Th. 2.101, etc. ; also, sister΄s son, Hdt. 4.147, Str. 10.5.6, etc.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ὁ, Neffe, Her. 1.65, s. ἀδελφιδοῦς.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)