STRONGS G4456:
													
												
									    		πωρόω, 
πώρω: 1 aorist 
ἐπωρωσα (
John 12:40 T Tr WH); perfect 
πεπώρωκα; perfect passive participle 
πεπωρωμενος; 1 aorist passive 
ἐπωρωθην; (
πῶρος, hard skin, a hardening, induration); 
to cover with a thick skin, to harden by covering with a callus (
R. V. everywhere simply to harden): metaphorically, 
καρδίαν, to make the heart dull, 
John 12:40; passive, 
to grow hard or callous, become dull, lose the power of understanding: 
Romans 11:7; 
τά νοήματα, 
2 Corinthians 3:14; 
ἡ καρδία, 
Mark 6:52; 
Mark 8:17. Cf. Fritzsche, Commentary on Mark, p. 78f; on Romans, ii., p. 451f. ((
Hippocrates (), 
Aristotle, others.)) 
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