Medical Dictionary

hard

adj \ˈhärd\

Medical Definition of HARD

1
:  not easily penetrated :  not easily yielding to pressure
2
a of liquor :  strongly alcoholic; specifically :  having an alcoholic content of more than 22.5 percent b :  characterized by the presence of salts (as of calcium or magnesium) that prevent lathering with soap <hard water>
3
:  of or relating to radiation of relatively high penetrating power <hard X-rays>
4
a :  physically fit <in good hard condition> b :  resistant to stress (as disease)
5
:  being at once addictive and gravely detrimental to health <such hard drugs as heroin>
6
:  resistant to biodegradation <hard detergents> <hard pesticides like DDT>
hard·ness noun

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