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Vulcanization :: Vulcanization (n.) The act or process of imparting to caoutchouc, gutta-percha, or the like, greater elasticity, durability, or hardness by heating with sulphur under pressure..

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..

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

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

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

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

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..

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.

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..

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..

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..

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

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..

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

Adamantine :: Adamantine (a.) Like the diamond in hardness or luster.

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

Diamond :: Diamond (n.) A precious stone or gem excelling in brilliancy and beautiful play of prismatic colors, and remarkable for extreme hardness..

Temper :: Temper (v. t.) To bring to a proper degree of hardness; as, to temper iron or steel..

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

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