STEP Greek Lexicon: νεφρός

νεφρός, -οῦ, ὁ

[in LXX for כִּלְיָה, Exo.29:13, al.; metaphorically, Psa.7:9 16:7 26:2, Wis.1:6, al. ;]

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

(AS)