Strong's #3510: nephros (pronounced nef-ros')

of uncertain affinity; a kidney (plural), i.e. (figuratively) the inmost mind:--reins.

Thayer's Greek Lexicon:

́

nephros

1) a kidney

2) kidneys, loins

2a) used of the inmost thoughts, feelings, purposes, of the soul

Part of Speech: noun masculine

Relation: of uncertain affinity

Citing in TDNT: 4:911, 630

Usage:

This word is used 1 times:

 

Revelation 2:23: "I am he which searcheth the reins and hearts: and I will give"