from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The act or process of becoming hard or harder.
  • n. Something that hardens, as a substance added to iron to yield steel.
  • n. Gradual exposure of plants to cold weather.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. Present participle of harden.
  • n. The process by which something hardens.
  • n. That which hardens, such as a material used for converting the surface of iron into steel.

from the GNU version of the Collaborative International Dictionary of English

  • n. Making hard or harder.
  • n. That which hardens, as a material used for converting the surface of iron into steel.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the process of becoming hard or solid by cooling or drying or crystallization
  • n. abnormal hardening or thickening of tissue
  • n. the act of making something harder (firmer or tighter or more compact)


Sorry, no etymologies found.


  • “It would not be important, even with its location unusual,” she replied, her expression hardening in a manner that made Fandral frown and the other druids stir, “if Elune herself had not revealed to me the dread truth.”


  • He focused on it, his expression hardening as he recognized what it was.


  • “I did,” Donatra said, her expression hardening, “but my largesse was rebuffed.”

    Star Trek: Typhon Pact: Rough Beasts of Empire

  • And then, with his expression hardening, he turns to the other agenda, the real one, the one the Brotherhood has nursed along since 1928--including a long period of of ideological alliance with the Nazis--the agenda that its Palestinian branch is applying in Gaza.

    Bernard-Henri Lévy: Egypt: Year Zero

  • His expression hardening, he opened them again and informed them, You should not have stayed!


  • Out of the question, Nero responded, his expression hardening.

    The Overload Protocol

  • Speaking of metallurgy, you do know that Case hardening is only so many thousands thick, and after flame cutind so much, the metal is not as strong.

    An Expert Gunsmith on Over-Pressure Rounds and Exploding Handguns

  • * To define and discuss the terms hardening, annealing, and tempering.

    Chapter 8

  • Hornblower saw Bush set his jaw, his expression hardening as he battled with his weakness.

    Flying Colours

  • Rajamohan A, Sinclair BJ (2008) Short-term hardening effects on survival of acute and chronic cold exposure by

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