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Penny :: Penny (n.) An English coin, formerly of copper, now of bronze, the twelfth part of an English shilling in account value, and equal to four farthings, or about two cents; -- usually indicated by the abbreviation d. (the initial of denarius)..

Torbernite :: Torbernite (n.) A mineral occurring in emerald-green tabular crystals having a micaceous structure. It is a hydrous phosphate of uranium and copper. Called also copper uranite, and chalcolite..

Gorget :: Gorget (n.) A small ornamental plate, usually crescent-shaped, and of gilded copper, formerly hung around the neck of officers in full uniform in some modern armies..

Dioptase :: Dioptase (n.) A hydrous silicate of copper, occurring in emerald-green crystals..

Mat :: Mat (n.) A name given by coppersmiths to an alloy of copper, tin, iron, etc., usually called white metal..

Tula Metal :: Tula metal () An alloy of silver, copper, and lead made at Tula in Russia..

Indigo :: Indigo (n.) A blue dyestuff obtained from several plants belonging to very different genera and orders; as, the woad, Isatis tinctoria, Indigofera tinctoria, I. Anil, Nereum tinctorium, etc. It is a dark blue earthy substance, tasteless and odorless, with a copper-violet luster when rubbed. Indigo does not exist in the plants as such, but is obtained by decomposition of the glycoside indican..

Volborthite :: Volborthite (n.) A mineral occurring in small six-sided tabular crystals of a green or yellow color. It is a hydrous vanadate of copper and lime.

Mill :: Mill (n.) A hardened steel roller having a design in relief, used for imprinting a reversed copy of the design in a softer metal, as copper..

Pewter :: Pewter (n.) A hard, tough, but easily fusible, alloy, originally consisting of tin with a little lead, but afterwards modified by the addition of copper, antimony, or bismuth..

Vitriol :: Vitriol (n.) A sulphate of any one of certain metals, as copper, iron, zinc, cobalt. So called on account of the glassy appearance or luster..

Kettledrum :: Kettledrum (n.) A drum made of thin copper in the form of a hemispherical kettle, with parchment stretched over the mouth of it..

Bell Metal :: Bell metal () A hard alloy or bronze, consisting usually of about three parts of copper to one of tin; -- used for making bells..

Doop :: Doop (n.) A little copper cup in which a diamond is held while being cut.

Centesimo :: Centesimo (n.) A copper coin of Italy and Spain equivalent to a centime.

Brood :: Brood (v. t.) Heavy waste in tin and copper ores.

Cable :: Cable (n.) A rope of steel wire, or copper wire, usually covered with some protecting or insulating substance; as, the cable of a suspension bridge; a telegraphic cable..

Domeykite :: Domeykite (n.) A massive mineral of tin-white or steel-gray color, an arsenide of copper..

Bronze :: Bronze (a.) An alloy of copper and tin, to which small proportions of other metals, especially zinc, are sometimes added. It is hard and sonorous, and is used for statues, bells, cannon, etc., the proportions of the ingredients being varied to suit the particular purposes. The varieties containing the higher proportions of tin are brittle, as in bell metal and speculum metal..

Tough-pitch :: Tough-pitch (n.) The exact state or quality of texture and consistency of well reduced and refined copper.

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