Lexical Definition

‎πωρόω‎ pōróō (po-ro'-o) to harden ^G:V
apparently from (a kind of stone)

blind, harden.

• to petrify, i.e. (figuratively) to indurate (render stupid or callous)

Abbott-Smith

πωρόω, -ῶ (< πῶρος, 1. a stone. 2. a callus), [in LXX: Jb 17:7 B (כּהה), Pr 10:20 A*;]
to petrify, harden, form a callus. Metaph., π. τ. καρδίαν, Jo 12:40. Pass., Ro 11:7; τ. νοήματα, II Co 3:14; ἡ καρδία, Mk 6:52 8:17.†

Abbott-Smith References

Liddell-Scott-Jones

πωρόω-όω,

(from {πῶρος}) petrify, λίθος πεπωρόωωμένος [Refs 2nd c.AD+]

__II cause a stone or callus to form:—passive, of a stone forming in the bladder, [Refs 5th c.BC+]
__II.2 unite fractured bones by a callus, [Refs 1st c.AD+]:—passive, become hard, [Refs 4th c.BC+]; become thickened, coagulated, [Refs 5th c.BC+]
__III in passive, become insensible, of the flesh, ὑπὸ τῆς πεπωρόωωμένης ἐκ τοῦ στέατος σαρκός [Refs 3rd c.BC+]: metaphorically, become insensible, obtuse, or blind, of the heart, [LXX+NT]

_{LSJ Scripture Refs: Mark.6.52 ☩ Rom.11.7 ☩ LXX.Job.17.7}