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Obduredness :: Obduredness (n.) Hardness.

Adamant :: Adamant (n.) A stone imagined by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness; but in modern mineralogy it has no technical signification. It is now a rhetorical or poetical name for the embodiment of impenetrable hardness.

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..

Durity :: Durity (n.) Hardness; firmness.

Stearolic :: Stearin (n.) One of the constituents of animal fats and also of some vegetable fats, as the butter of cacao. It is especially characterized by its solidity, so that when present in considerable quantity it materially increases the hardness, or raises the melting point, of the fat, as in mutton tallow. Chemically, it is a compound of glyceryl with three molecules of stearic acid, and hence is technically called tristearin, or glyceryl tristearate..

Irony :: Irony (a.) Resembling iron taste, hardness, or other physical property..

Steel :: Steel (n.) Fig.: Anything of extreme hardness; that which is characterized by sternness or rigor.

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..

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..

Temper :: Temper (n.) The state of a metal or other substance, especially as to its hardness, produced by some process of heating or cooling; as, the temper of iron or steel..

Wireworm :: Wireworm (n.) One of the larvae of various species of snapping beetles, or elaters; -- so called from their slenderness and the uncommon hardness of the integument. Wireworms are sometimes very destructive to the roots of plants. Called also wire grub..

Sclerometer :: Sclerometer (n.) An instrument for determining with accuracy the degree of hardness of a mineral.

Induration :: Induration (n.) Hardness of character, manner, sensibility, etc.; obduracy; stiffness; want of pliancy or feeling..

Rigor :: Rigor (n.) Stiffness of opinion or temper; rugged sternness; hardness; relentless severity; hard-heartedness; cruelty.

Disthene :: Disthene (n.) Cyanite or kyanite; -- so called in allusion to its unequal hardness in two different directions. See Cyanite.

Flintiness :: Flintiness (n.) The state or quality of being flinty; hardness; cruelty.

Tungsten :: Tungsten (n.) A rare element of the chromium group found in certain minerals, as wolfram and scheelite, and isolated as a heavy steel-gray metal which is very hard and infusible. It has both acid and basic properties. When alloyed in small quantities with steel, it greatly increases its hardness. Symbol W (Wolframium). Atomic weight, 183.6. Specific gravity, 18..

Chill :: Chill (v. t.) To produce, by sudden cooling, a change of crystallization at or near the surface of, so as to increase the hardness; said of cast iron..

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..

Tempering :: Tempering (n.) The process of giving the requisite degree of hardness or softness to a substance, as iron and steel; especially, the process of giving to steel the degree of hardness required for various purposes, consisting usually in first plunging the article, when heated to redness, in cold water or other liquid, to give an excess of hardness, and then reheating it gradually until the hardness is reduced or drawn down to the degree required, as indicated by the color produced on a polished p

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