Cochineal: A color procured from the cochineal insect, (or Coccus cacti,) which feeds upon the leaves of several species of the plant called cactus, and which is supposed to derive its coloring matter from its food. Its natural color is crimson; but, by the addition of a preparation of potash, it yields a rich scarlet dye.
Cologne-water: A fragrant perfume, which derives its name from having been originally made in the city of Cologne, which is situated on the river Rhine, in Germany. The best kind is still procured from that city.
Comparative anatomy: The science which has for its object a comparison of the anatomy, structure, and functions of the various organs of animals, plants, etc., with those of the human body.
Confection: A sweetmeat; a preparation of fruit with sugar; also a preparation of medicine with honey, syrup, or similar saccharine substance, for the purpose of disguising the unpleasant taste of the medicine.
Cooper, Sir Astley Paston: A celebrated English surgeon, who was born at Brooke, in Norfolk county, England, August 23d, 1768, and commenced the practice of surgery in London, in 1792. He was appointed surgeon to King George IV. in 1827, was created a baronet in 1831, and died February 12th, 1841. He was the author of many valuable works.
Copal: A hard, shining, transparent resin, of a light citron color, brought originally from Spanish-America, and now almost wholly from the East-Indies. It is principally employed in the preparation of copal varnish.
Copper, Sulphate of: See _Sulphate of copper.
Copperas: (Sulphate of iron or green vitriol,) a bright green mineral substance, formed by the decomposition of a peculiar ore of iron called pyrites, which is a sulphuret of iron. It is first in the form of a greenish-white powder or crust, which is dissolved in water, and beautiful green crystals of copperas are obtained by evaporation. It is principally used in dyeing and in making black ink. Its solution, mixed with a decoction of oak bark, produces a black color.
Coronary: Relating to a crown or garland. In anatomy, it is applied to arteries which encompass the heart, in the manner, as it is fancied, of a garland.
Corrosive sublimate: A poisonous substance composed of chlorine and quicksilver.