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Coal tar   /koʊl tɑr/   Listen
noun
Coal  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. Note: This word is often used adjectively, or as the first part of self-explaining compounds; as, coal-black; coal formation; coal scuttle; coal ship. etc. Note: In England the plural coals is used, for the broken mineral coal burned in grates, etc.; as, to put coals on the fire. In the United States the singular in a collective sense is the customary usage; as, a hod of coal.
Age of coal plants. See Age of Acrogens, under Acrogen.
Anthracite or Glance coal. See Anthracite.
Bituminous coal. See under Bituminous.
Blind coal. See under Blind.
Brown coal or Brown Lignite. 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. (Geol.)
(a)
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. (Colloq.)
Wood coal. See Lignite.


Coal tar  n.  A thick, black, tarry liquid, obtained by the distillation of bituminous coal in the manufacture of illuminating gas; used for making printer's ink, black varnish, etc. It is a complex mixture from which many substances have been obtained, especially hydrocarbons of the benzene or aromatic series. Note: Among its important ingredients are benzene, aniline, phenol, naphtalene, anthracene, etc., which are respectively typical of many dye stuffs, as the aniline dyes, the phthaleïns, indigo, alizarin, and many flavoring extracts whose artificial production is a matter of great commercial importance.


Tar  n.  A thick, black, viscous liquid obtained by the distillation of wood, coal, etc., and having a varied composition according to the temperature and material employed in obtaining it.
Coal tar. See in the Vocabulary.
Mineral tar (Min.), a kind of soft native bitumen.
Tar board, a strong quality of millboard made from junk and old tarred rope.
Tar water.
(a)
A cold infusion of tar in water, used as a medicine.
(b)
The ammoniacal water of gas works.
Wood tar, tar obtained from wood. It is usually obtained by the distillation of the wood of the pine, spruce, or fir, and is used in varnishes, cements, and to render ropes, oakum, etc., impervious to water.





Collaborative International Dictionary of English 0.48


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"Coal tar" Quotes from Famous Books



... down to the mouth of the Tiger's Trap so soon as you've strewed some fagots ready for lighting in the sheds. When you get to the Trap, tell the gunner to take a gang of hands and give that battery a good coat of coal tar, plug the vents of the guns, and bury carriages and all in the sand beside the magazine. Tell him to destroy the powder, and pitch overboard all he can't conceal; and let him bear a hand about it, for we shall sail with the last of ...
— Captain Brand of the "Centipede" • H. A. (Henry Augustus) Wise
... portion of the roof on the south side can be raised when it is desirable to harden off the plants in spring. The foundation is of wood, locust posts being used, with boards nailed upon both sides and coated with coal tar. The house is forty one feet long and sixteen feet wide, and is heated by a tank constructed as follows: brick piers are built three feet apart on which are laid common blue flag stones six feet long and two feet ...
— Woodward's Graperies and Horticultural Buildings • George E. Woodward
... serpent came; as usual, forced his head and part of his body down the hatchway, perceived me, and with eyes darting fire reached out his head to seize me. I dashed the broom into his mouth, and bobbed my head immediately under the coal tar. When I lifted it up again, almost suffocated, the animal had disappeared. I crawled out, and looking over the side, perceived him lashing the ocean in his fury, plunging and diving to rid himself of the composition with which I had filled his mouth. After exhausting himself with his furious endeavours, ...
— The Pacha of Many Tales • Frederick Marryat
... less permanent than natural ones. This is seldom the case; as a matter of fact, some of the fastest and most valuable dyes are now made artificially and many are not procurable from vegetable coloring matters. Most of the cheaper dyes made from coal tar are fugitive; that is, they fade in sunlight or water or in both. They are often still further cheapened by being adulterated with salt, dextrine and the like. Such are the colors which are usually sold by the Chinese ...
— Philippine Mats - Philippine Craftsman Reprint Series No. 1 • Hugo H. Miller
... this work, which have recently been published in bulletin form, it is concluded that the use of white lead, white zinc, yellow ochre, coal tar, shellac and avenarious carbolineum as coverings for wounds under five inches in diameter is not only useless, but usually detrimental to the tree. This is particularly true of peaches, and perhaps of some other stone fruits, which, according to recommendations, should ...
— Trees, Fruits and Flowers of Minnesota, 1916 • Various
... the addition of Glauber's salt, or some other alkaline salt, the essential feature or principle being that the bath is an acid one. This method is applicable to the large group of azo dye-stuffs derived from coal tar, and also to the acid dyes prepared from the basic coal-tar colours by ...
— The Dyeing of Woollen Fabrics • Franklin Beech
... shouts, from shouts to yells, then broke in a crescendo of turmoil. Collars came loose and voices grew hoarse. The restrained anxiety had swept into an open furore of fear. It looked as if the bottom were dropping out of Coal Tar Products. At once a dozen operators raced for their telephones. Hamilton Burton had struck, and his first blow was on Coal Tars! That was the whispered word that ...
— Destiny • Charles Neville Buck
... as those of the seaboard. A thatch, whose projecting eaves form deep shady verandahs, surmounts walls of split bamboo, supported by raised platforms of tamped earth, windows being absent and chimneys unknown; the ceiling is painted like coal tar by oily soot, and two opposite doors make the home a passage through which no one hesitates to pass. The walls are garnished with weapons and nets, both skilfully made, and the furniture consists of cooking utensils and water-pots, mats for bedding, ...
— Two Trips to Gorilla Land and the Cataracts of the Congo Volume 1 • Richard F. Burton
... Liquor carbonis detergens is made by mixing together nine ounces of tincture soap bark and four ounces of coal tar, allowing to digest for eight days, and filtering. The tincture of soap bark used is made with one pound of soap bark to one gallon of 95 per cent. alcohol, digesting for a week or so. Instead of the proprietary name above, ...
— Essentials of Diseases of the Skin • Henry Weightman Stelwagon


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