Definition of hardness

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Hardness (n.) The peculiar quality exhibited by water which has mineral salts dissolved in it. Such water forms an insoluble compound with soap, and is hence unfit for washing purposes..

Lern More About Hardness

Phosphor-bronze :: Phosphor-bronze (n.) A variety of bronze possessing great hardness, elasticity, and toughness, obtained by melting copper with tin phosphide. It contains one or two per cent of phosphorus and from five to fifteen per cent of tin..
Linoleum :: Linoleum (n.) Linseed oil brought to various degrees of hardness by some oxidizing process, as by exposure to heated air, or by treatment with chloride of sulphur. In this condition it is used for many of the purposes to which India rubber has been applied..
Scleroderma :: Scleroderma (n.) A disease of adults, characterized by a diffuse rigidity and hardness of the skin..
Durometer :: Durometer (n.) An instrument for measuring the degree of hardness; especially, an instrument for testing the relative hardness of steel rails and the like..
Iridosmium :: Iridosmium (n.) The native compound of iridium and osmium. It is found in flattened metallic grains of extreme hardness, and is often used for pointing gold pens..
Opal :: Opal (n.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity..
Petrifaction :: Petrifaction (n.) The process of petrifying, or changing into stone; conversion of any organic matter (animal or vegetable) into stone, or a substance of stony hardness..
Adamantine :: Adamantine (a.) Like the diamond in hardness or luster.
Flintiness :: Flintiness (n.) The state or quality of being flinty; hardness; cruelty.
Impenitence :: Impenitence (n.) The condition of being impenitent; failure or refusal to repent; hardness of heart.
Irony :: Irony (a.) Resembling iron taste, hardness, or other physical property..
Proof :: Proof (n.) The quality or state of having been proved or tried; firmness or hardness that resists impression, or does not yield to force; impenetrability of physical bodies..
Carbuncle :: Carbuncle (n.) A very painful acute local inflammation of the subcutaneous tissue, esp. of the trunk or back of the neck, characterized by brawny hardness of the affected parts, sloughing of the skin and deeper tissues, and marked constitutional depression. It differs from a boil in size, tendency to spread, and the absence of a central core, and is frequently fatal. It is also called anthrax..
Petrifaction :: Petrifaction (n.) Fig.: Hardness; callousness; obduracy.
Grain :: Grain (n.) The composite particles of any substance; that arrangement of the particles of any body which determines its comparative roughness or hardness; texture; as, marble, sugar, sandstone, etc., of fine grain..
Iron :: Iron (n.) Like iron in hardness, strength, impenetrability, power of endurance, insensibility, etc.;.
Disthene :: Disthene (n.) Cyanite or kyanite; -- so called in allusion to its unequal hardness in two different directions. See Cyanite.
Crustiness :: Crustiness (n.) The state or quality of having crust or being like crust; hardness.
Stern :: Stern (superl.) Having a certain hardness or severity of nature, manner, or aspect; hard; severe; rigid; rigorous; austere; fixed; unchanging; unrelenting; hence, serious; resolute; harsh; as, a sternresolve; a stern necessity; a stern heart; a stern gaze; a stern decree..
Beryl :: Beryl (n.) A mineral of great hardness, and, when transparent, of much beauty. It occurs in hexagonal prisms, commonly of a green or bluish green color, but also yellow, pink, and white. It is a silicate of aluminium and glucinum (beryllium). The aquamarine is a transparent, sea-green variety used as a gem. The emerald is another variety highly prized in jewelry, and distinguished by its deep color, which is probably due to the presence of a little oxide of chromium..
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