Quick Definition
a kidney as a general emotional center
Strong's Definition
a kidney (plural), i.e. (figuratively) the inmost mind
Derivation: of uncertain affinity;
KJV Usage: reins
Thayer's Greek Lexicon
νεφρός, νεφρου, ὁ, a kidney (Plato, Aristophanes); plural the kidneys, the loins, as the Sept. for λΐΜμΘιεϊ, used of the inmost thoughts, feelings, purposes, of the soul: with the addition of καρδίας, Rev_2:23, with which cf. Psa_7:10; Jer_11:20; Jer_17:10; Wis_1:6.
Mounce Concise Greek Dictionary
νεφρός nephros 1x
a kidney; pl. νεφροί , the kidneys, reins; from the Hebrew the reins regarded as a seat of desire and affection, Rev_2:23
Abbott-Smith Greek Lexicon
νεφρός , -οῦ , ὁ ,
[in LXX for H3629 , Exo_29:13 , al. ; metaph ., Psa_7:9 ; Psa_16:7 ; Psa_26:2 , Wis_1:6 , al. ;]
a kidney; pl ., the kidneys, reins; metaph ., of the will and affections: ν . καί καρδίαι (thoughts), Rev_2:23 .†
Moulton & Milligan — Vocabulary of the Greek NT
νεφρός [page 425]
In the astrological P Ryl II. 63 .7 (iii/A.D.) we find the kidneys assigned to Saturn Κρόνου νεφροί . For the diminutive cf. P Oxy I. 108 i. 9 (A.D. 183 or 215) γλῶσσα μία , νεφρία β̄ , 1 tongue, 2 kidneys a cook s monthly meat bill.
Liddell-Scott — Intermediate Greek Lexicon
νεφρός νεφρός, οῦ, ὁ, in pl. "the kidneys", Plat. , etc.; so in dual, Ar.
STEPBible — Tyndale Abridged Greek Lexicon
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)