Coal

Definition of Coal

Pronunciation: kōl
n.1.A thoroughly charred, and extinguished or still ignited, fragment from wood or other combustible substance; charcoal.
2.(Min.) A black, or brownish black, solid, combustible substance, dug from beds or veins in the earth to be used for fuel, and consisting, like charcoal, mainly of carbon, but more compact, and often affording, when heated, a large amount of volatile matter.
Age of coal plants
See Age of Acrogens, under Acrogen.
Anthracite
See Anthracite.
Bituminous coal
See under Bituminous.
Blind coal
See under Blind.
Brown coal
See Lignite.
Caking coal
a bituminous coal, which softens and becomes pasty or semi-viscid when heated. On increasing the heat, the volatile products are driven off, and a coherent, grayish black, cellular mass of coke is left.
Cannel coal
a very compact bituminous coal, of fine texture and dull luster. See Cannel coal.
Coal bed
(Geol.) a layer or stratum of mineral coal.
Coal breaker
a structure including machines and machinery adapted for crushing, cleansing, and assorting coal.
Coal field
(Geol.) a region in which deposits of coal occur. Such regions have often a basinlike structure, and are hence called coal basins. See Basin.
Coal gas
a variety of carbureted hydrogen, procured from bituminous coal, used in lighting streets, houses, etc., and for cooking and heating.
Coal heaver
a man employed in carrying coal, and esp. in putting it in, and discharging it from, ships.
Coal measures
a - (Geol.) Strata of coal with the attendant rocks.
b - A subdivision of the carboniferous formation, between the millstone grit below and the Permian formation above, and including nearly all the workable coal beds of the world.
Coal oil
a general name for mineral oils; petroleum.
Coal plant
(Geol.) one of the remains or impressions of plants found in the strata of the coal formation.
Coal tar
See in the Vocabulary.
To haul over the coals
to call to account; to scold or censure.
Wood coal
See Lignite.
v. t.1.To burn to charcoal; to char.
[imp. & p. p. Coaled ; p. pr. & vb. n. Coaling.]
Charcoal of roots, coaled into great pieces.
- Bacon.
2.To mark or delineate with charcoal.
3.To supply with coal; as, to coal a steamer.
v. i.1.To take in coal; as, the steamer coaled at Southampton.

Related Words

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Coalescence
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