Coal

  A readily combustible black or brownish-black rock whose composition, including inherent moisture, consists of more than 50 percent by weight and more than 70 percent by volume of carbonaceous material. It is formed from plant remains that have been compacted, hardened, chemically altered, and metamorphosed by heat and pressure over geologic time.
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary
  ***
  Black or brown rock, formed under pressure from organic fossils in prehistoric times, that is mined and burned to produce heat energy.
  California Energy Comission. Dictionary of Energy Terms

Energy terms . 2014.

Look at other dictionaries:

  • coal — n a brown to black combustible sedimentary rock (in the geological sense) composed principally of consolidated and chemically altered plant remains. DISCUSSION Conditions required for formation of coal are believed to include accumulation of… …   Coke&Coal Terminology

  • Coal — Sedimentary Rock Anthracite coal Composition Primary carbon Secondary hydrogen, sulfur …   Wikipedia

  • Coal — (k[=o]l), n. [AS. col; akin to D. kool, OHG. chol, cholo, G. kohle, Icel. kol, pl., Sw. kol, Dan. kul; cf. Skr. jval to burn. Cf. {Kiln}, {Collier}.] 1. A thoroughly charred, and extinguished or still ignited, fragment from wood or other… …   The Collaborative International Dictionary of English

  • coal — [ koul ] noun *** uncount a hard black substance that is dug from the ground and burned as fuel to provide heat: Put some more coal on the fire. coal dust a piece/lump of coal a. uncount used for talking about the industry of digging coal out of… …   Usage of the words and phrases in modern English

  • coal — [kōl] n. [ME & OE col, charcoal, live coal, akin to Ger kohle, ON kol < IE base * g(e)u lo , live coal > Ir gual] 1. a kind of dark brown to black, combustible, sedimentary rock resulting from the partial decomposition of vegetable matter… …   English World dictionary

  • coal — W2S3 [kəul US koul] n [: Old English; Origin: col] 1.) [U] a hard black mineral which is dug out of the ground and burnt to produce heat ▪ Put some coal on the fire. ▪ the coal mining industry ▪ a lump of coal 2.) [C usually plural] a piece of… …   Dictionary of contemporary English

  • coal — O.E. col charcoal, live coal, from P.Gmc. *kula(n) (Cf. O.Fris. kole, M.Du. cole, Du. kool, O.H.G. chol, Ger. Kohle, O.N. kol), from PIE root *g(e)u lo live coal (Cf. Ir. gual coal ). Meaning mineral consisting of fo …   Etymology dictionary

  • Coal — Coal, v. t. [imp. & p. p. {Coaled}; p. pr. & vb. n. {Coaling}.] 1. To burn to charcoal; to char. [R.] [1913 Webster] Charcoal of roots, coaled into great pieces. Bacon. [1913 Webster] 2. To mark or delineate with charcoal. Camden. [1913 Webster]… …   The Collaborative International Dictionary of English

  • Coal — Coal, v. i. To take in coal; as, the steamer coaled at Southampton. [1913 Webster] …   The Collaborative International Dictionary of English

  • coal|er — «KOH luhr», noun. 1. a ship, freight car, or railroad, used for carrying or supplying coal. 2. a worker or merchant who supplies coal …   Useful english dictionary

  • coal|y — «KOH lee», adjective. 1. of or like coal. 2. containing coal …   Useful english dictionary

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