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

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

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

Hardness :: Hardness (n.) The cohesion of the particles on the surface of a body, determined by its capacity to scratch another, or be itself scratched;-measured among minerals on a scale of which diamond and talc form the extremes..

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..

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

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..

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

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

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

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

Sear :: Sear (a.) To burn (the surface of) to dryness and hardness; to cauterize; to expose to a degree of heat such as changes the color or the hardness and texture of the surface; to scorch; to make callous; as, to sear the skin or flesh. Also used figuratively..

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

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

Petrifaction :: Petrifaction (n.) Fig.: Hardness; callousness; obduracy.

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..

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..

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..

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

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

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