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Obduration :: Obduration (n.) A hardening of the heart; hardness of heart.

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..

Occidental :: Occidental (a.) Possessing inferior hardness, brilliancy, or beauty; -- used of inferior precious stones and gems, because those found in the Orient are generally superior..

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.

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

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.

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..

Obduracy :: Obduracy (n.) The duality or state of being obdurate; invincible hardness of heart; obstinacy.

Crustiness :: Crustiness (n.) The state or quality of having crust or being like crust; hardness.

Rigor :: Rigor (n.) The becoming stiff or rigid; the state of being rigid; rigidity; stiffness; hardness.

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

Spinel :: Spinelle (n.) A mineral occuring in octahedrons of great hardness and various colors, as red, green, blue, brown, and black, the red variety being the gem spinel ruby. It consist essentially of alumina and magnesia, but commonly contains iron and sometimes also chromium..

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

Boron :: Boron (n.) A nonmetallic element occurring abundantly in borax. It is reduced with difficulty to the free state, when it can be obtained in several different forms; viz., as a substance of a deep olive color, in a semimetallic form, and in colorless quadratic crystals similar to the diamond in hardness and other properties. It occurs in nature also in boracite, datolite, tourmaline, and some other minerals. Atomic weight 10.9. Symbol B..

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..

Solidity :: Solidity (n.) The state or quality of being solid; density; consistency, -- opposed to fluidity; compactness; fullness of matter, -- opposed to openness or hollowness; strength; soundness, -- opposed to weakness or instability; the primary quality or affection of matter by which its particles exclude or resist all others; hardness; massiveness..

Petrify :: Petrify (v. i.) To become stone, or of a stony hardness, as organic matter by calcareous deposits..

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..

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..

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