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1. The degree of firmness of a solid, as determined by its resistance to deformation, scratching, or abrasion.
See also: hardness scale, number.
2. The relative penetrating power of a beam of x-rays, used both within the diagnostic range of energy and in radiation therapy; expressed in terms of half-value layer.
Farlex Partner Medical Dictionary © Farlex 2012


1. The degree of firmness of a solid, as determined by its resistance to deformation, scratching, or abrasion.
2. The relative penetrating power of a beam of x-rays.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about hardness

Q. Why is it so hard???? Why is it so hard to quit drinking ? i try and i try and it seems like i can't find the strength to stop completely .. every time i am almost there .. but than i just snap!

A. HI....find out about alcoholics anonymous in your town,call their 800#...go to(INTHEROOMS.com)find HELP.......mrfoot56

Q. i cant stop getting a hard on erection stiffy embarrassing crease in trousers

A. Have you heard of priapism,a condition in which the penis is continually erect; usually painful and seldom with sexual arousal. If you suffer from this you should go see a doctor about it.

Q. anyone knows how to stop hard skin on the feet from becoming cracked??? during summer my feet got lots of hard skin and in the heel area the skin actually got cracked kinda deep. it hurts now and the cracks are starting to get infected I guess... do u guys know how to solve this?? I know there are some creams for that but I thought maybe now it's too late for that and I need something stronger?

A. There are good creams for moisterizing the skin of your feet on a daily basis, however now that you feel they might be infected you should see a dermatologist for some better treatment.

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References in periodicals archive ?
Later, in 1939, Fredrick Knoop introduced an alternative to the micro Vickers hardness test, signified as the Knoop hardness test.
Standard Ordinal Classification of Water Based on Total Hardness
If hardness of water is very high it may even cause non uniform dyeing.
Table-2: Hardness of tap water samples from different districts of KPK, in terms of CaCO3, and their pH Values.
The presented work deals with relatively more reliable and accurate hardness analysis in heterogeneous structures engineering.
Variability: Metal castings are not homogenous, and hardness variations will occur throughout the typical casting, though the variation between locations should not be dramatic.
Test of hardness according to Vickers is prescribed by European standard CSN EN ISO 6507-1.
3.2 Comparative analysis on surface hardness of plant leaves
The following investigations must be carried out for the abovementioned purposes: the visual inspection of rim surface, the analysis of wheel metal hardness, a chemical composition analysis of wheel metal, the analysis of wheel production documentation and its comparison with findings on wheel hardness and chemical composition analyses.
(9-10) However, changes to the physical properties (such as hardness) resulting from addition of these materials have not been investigated.