Columbia Encyclopedia

Search results

336 results found

plastic

(Encyclopedia)plastic, any organic material with the ability to flow into a desired shape when heat and pressure are applied to it and to retain the shape when they are withdrawn. The first important plastic, cel...

plastic surgery

(Encyclopedia)plastic surgery, surgical repair of congenital or acquired deformities and the restoration of contour to improve the appearance and function of tissue defects. Development of this specialized branch o...

celluloid

(Encyclopedia)celluloid [from cellulose], transparent, colorless synthetic plastic made by treating cellulose nitrate with camphor and alcohol. Celluloid was the first important synthetic plastic and was widely use...

polycarbonates

(Encyclopedia)polycarbonates, group of clear, thermoplastic polymers used mainly as molding compounds (see plastic). Polycarbonates are prepared by the reaction of an aromatic difunctional phenol with either phosge...

polyvinyl chloride

(Encyclopedia)polyvinyl chloride (PVC), thermoplastic that is a polymer of vinyl chloride. Resins of polyvinyl chloride are hard, but with the addition of plasticizers a flexible, elastic plastic can be made. This ...

Murray, Joseph Edward

(Encyclopedia)Murray, Joseph Edward, 1919–2012, American surgeon, b. Milford, Mass., M.D. Harvard, 1943. Trained as a plastic surgeon, Murray became interested in organ transplants, performing the first human kid...

polystyrene

(Encyclopedia)polystyrene pŏlˌēstīˈrēn [key], widely used plastic; it is a polymer of styrene. Polystyrene is a colorless, transparent thermoplastic that softens slightly above 100℃ (212℉) and becomes a v...

polyacrylics

(Encyclopedia)polyacrylics pŏlˌēəkrĭlˈĭks [key], group of thermoplastics that are transparent and highly decorative (see plastic). The polyacrylics, or acrylic plastics, are polymers (and copolymers) of deri...

splint

(Encyclopedia)splint, rigid or semiflexible device for the immobilization of displaced or fractured parts of the body. Most commonly employed for fractures of bones, a splint may be a first-aid measure that allows ...

polypropylene

(Encyclopedia)polypropylene pŏlˌēprōˈpəlēn [key], plastic noted for its light weight, being less dense than water; it is a polymer of propylene. It resists moisture, oils, and solvents. Since its melting poi...