Strong's #4456: poroo (pronounced po-ro'-o)

apparently from poros (a kind of stone); to petrify, i.e. (figuratively) to indurate (render stupid or callous):-- blind, harden.

Thayer's Greek Lexicon:

́

pōroō

1) to cover with a thick skin, to harden by covering with a callus

2) metaphorically

2a) to make the heart dull

2b) to grow hard, callous, become dull, lose the power of understanding

Part of Speech: verb

Relation: apparently from poros (a kind of stone)

Citing in TDNT: 5:1025, 816

Usage:

This word is used 5 times:

 

Mark 6:52: "their heart was hardened."
Mark 8:17: "ye your heart yet hardened?"
John 12:40: "their eyes, and hardened their heart; that they should not"
Romans 11:7: "it, and the rest were blinded."
2 Corinthians 3:14: "But their minds were blinded: for until this day remaineth"