STRONGS G4457:
													
												
									    		πώρωσις, 
πωρωσεως, 
ἡ (
πωρόω, which see), properly, 
the covering with a callus; tropically, 
obtuseness of mental discernment, dulled perception: 
γέγονε τίνι, the mind of one has been blunted (
R. V. a hardening hath befallen), 
Romans 11:25; 
τῆς καρδίας (hardening of heart), of stubbornness, obduracy, 
Mark 3:5; 
Ephesians 4:18. ((
Hippocrates)) 
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