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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..

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..

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..

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..

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..

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..

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..

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

Iron :: Iron (n.) Like iron in hardness, strength, impenetrability, power of endurance, insensibility, etc.;.

Softness :: Softness (n.) The quality or state of being soft; -- opposed to hardness, and used in the various specific senses of the adjective..

Mollify :: Mollify (v. t.) To soften; to make tender; to reduce the hardness, harshness, or asperity of; to qualify; as, to mollify the ground..

Opal :: Opal (n.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity..

Scleroderma :: Scleroderma (n.) A disease of adults, characterized by a diffuse rigidity and hardness of the skin..

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

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..

Stone :: Stone (n.) Fig.: Symbol of hardness and insensibility; torpidness; insensibility; as, a heart of stone..

Impenitence :: Impenitence (n.) The condition of being impenitent; failure or refusal to repent; hardness of heart.

Obfirmation :: Obfirmation (n.) Hardness of heart; obduracy.

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

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

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