Dictionary entry

νεφρός

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

νεφρός, -οῦ, ὁ,

[in LXX for כִּלְיָה, Ex 29:13, al.; metaph., Ps 7:9 15 (16):7 25 (26):2, Wi 1:6, al.;]

a kidney; pl., the kidneys, reins; metaph., of the will and affections: ν. καί καρδίαι (thoughts), Re 2:23.†