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Briard

(Encyclopedia)Briard brēärdˈ [key], breed of muscular, wiry working dog whose origins may be traced back to 12th-century France. It stands from 22 to 27 in. (55.9–68.6 cm) high at the shoulder and weighs betwe...

tracery

(Encyclopedia)CE5 Types of tracery tracery, bands or bars of stone, wood, or other material, either subdividing an opening or standing in relief against a wall and forming an ornamental pattern of solid members...

sulfuric acid

(Encyclopedia)sulfuric acid, chemical compound, H2SO4, colorless, odorless, extremely corrosive, oily liquid. It is sometimes called oil of vitriol. Although sulfuric acid is now one of the most widely used c...

Makatea

(Encyclopedia)Makatea ôrôrˈə [key], island, South Pacific, one of the most northwesterly of the Tuamotu Archipelago, French Polynesia. The center of the island was once a solid mass of phosphate that was mined ...

area

(Encyclopedia)CE5 area, measure of the size of a surface region, usually expressed in units that are the square of linear units, e.g., square feet or square meters. In elementary geometry, formulas for the areas...

Anderson, Philip Warren

(Encyclopedia)Anderson, Philip Warren, 1923–2020, American physicist, b. Indianapolis, Ind., Ph.D. Harvard, 1949. After graduation he worked at Bell Laboratories until 1984. From 1967 he also was on the faculty a...

ammonium nitrate

(Encyclopedia)ammonium nitrate, chemical compound, NH4NO3, that exists as colorless, rhombohedral crystals at room temperature but changes to monoclinic crystals when heated above 32℃. It is extremely soluble in ...

embolus

(Encyclopedia)embolus ĕmˈbələs [key], foreign matter circulating in and obstructing a blood vessel. It may be a portion of a clot that has separated from the wall of a vessel (see thrombosis), a bubble of gas o...

Sealyham terrier

(Encyclopedia)Sealyham terrier sēˈlēhămˌ [key], breed of short-legged terrier developed in Wales in the second half of the 19th cent. It stands about 10 in. (25 cm) high at the shoulder and weighs about 20 lb ...

polyurethanes

(Encyclopedia)polyurethanes pŏlˌēyo͝orˈəthānz [key], group of plastics that may be either thermosetting or thermoplastic. Polyurethane can be made into both flexible and rigid foams. The flexible foam is oft...