- 1
The quality of being hard.countableuncountable
- Who can number the cloudes in wiſedom? or who can ſtay the bottles of heauen, / When the duſt groweeh^([sic – meaning groweth]) into hardneſſe and the clods cleaue faſt together?
- 2
An instance of this quality; hardship.countableuncountable
- 3
The quantity of calcium carbonate dissolved in water, usually expressed in parts per million (ppm).countableuncountable
- 4
The resistance to scratching, cutting, indentation or abrasion of a metal or other solid material.countableuncountable
- 5
The penetrating ability of electromagnetic radiation, such as x-rays; generally, the shorter the wavelength, the harder and more penetrating the radiation.countableuncountable
- 6
The measure of resistance to damage of a facility, equipment, installation, or telecommunications infrastructure when subjected to attack.countableuncountable
- 7
A measure of how hard a material is.countable
- The hardness of the material was high.
syn. callosity · durity · firmness · hardness · induration · inflexibility · rigidity · renitence · renitency · stiffness · temper
ant. softness