πωρόω (pōróōpo-ro'-overbto harden)
[Grk] πωρόω, πηρόω LN: 27.51 GK: G4800 Hebrew: כָּהָה
Derivation: apparently from πῶρος (a kind of stone);
Strong's: to petrify, i.e. (figuratively) to indurate (render stupid or callous)
KJV: -- blind, harden.