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tar

 [tahr]
a dark brown or black viscid liquid from the wood of various species of pine, or found as a by-product of the destructive distillation of bituminous coal (see coal tar). It is a complex mixture, the source of organic substances such as cresol, creosol, naphthalene, paraffin, phenol, and toluene. Formerly used as an oral medication in treatment of various conditions, it has been found to be toxic and carcinogenic and now has only limited topical use in certain skin diseases.
coal tar a by-product obtained in destructive distillation of bituminous coal; if its fumes are inhaled or if it is ingested in its natural state, it is toxic and carcinogenic. A preparation is used in ointment or solution in treatment of eczema and psoriasis.

TAR

Acronym for thrombocytopenia and absent radius. See: thrombocytopenia-absent radius syndrome.

tar

(tahr),
A thick, semisolid, blackish brown mass, of complex hydrocarbon composition, obtained by destructive distillation of carbonaceous materials. For individual tars, see specific names.

tar

(tär)
n.
1. A dark, oily, viscous material, consisting mainly of hydrocarbons, produced by the destructive distillation of organic substances such as wood, coal, or peat.
2. See coal tar.
3. A solid residue of tobacco smoke containing byproducts of combustion.

TAR

Abbreviation for thrombocytopenia and absent radius.
See: thrombocytopenia-absent radius syndrome
References in periodicals archive ?
To obtain carbon materials or carbon/carbon composites with coal tar pitch as the matrix precursor, it is necessary to perform the deep processing of coal tar pitch [7, 8].
Coal tar pitches (CTPs) are the most important binders used in the synthetic graphite industry due to their ability to form pure carbon residues in high yield, together with good adhesive properties after carbonization and graphitization [1].
Coal tar pitch is a complex mixture of the residue from the distillation of high temperature coal tar with an approximate softening point of 90 to 180 degree C.
This paper descried the possibility of increasing the carbonisation residue of the reaction of coal tar pitch with 9.10-bis(chloromethyl)anthracene, which was prepared by chloromethylation of anthracene.
EHP regrets the incorrect and unintentional inference in "Paving Paradise: The Peril of Impervious Surfaces" [Environ Health Perspect 113:A456-A462 (2005)] that coal tar pitch is used in the actual hot-mix asphalt used to pave roads.
[ClickPress, Thu May 30 2019] This MRRSE study offers a ten-year analysis and forecast for the global Coal Tar Pitch Market between 2018 and 2028.
However, the long-term experiment's ninth drop could be due between the next five seconds and the next 12 months, when the blob of tar pitch stretching down from the cocktail glass shaped thing will fall on the eight other blobs settled below it, Courier Mail reported.
Operating since 1947, the former Powell Duffryn plant combined coal too small to sell with tar pitch in ovoid briquettes, removing most of the smoke content.
In 2010, 811,000 tonnes of alumina, 140,000 tonnes of calcined petroleum coke and 24,000 tonnes of coal tar pitch were used by the smelter during production, he revealed.
25 August 2010 - Indian credit rating agency CRISIL maintained the ratings of BB+ with a "stable" outlook and of P4+ on the bank facilities of local coal tar pitch maker and trader Kedia Carbon Pvt Ltd.
In this report, are presented laboratory-scale investigations of (i) the solid component called synthetic coking coal, SCC that is prepared by mixing selected carbonaceous wastes with a coal tar pitch and (ii) composite mixtures of SCC with a typical coking coal blend (CB) used in the stamp charging method of coke manufacturing in Poland.
Coal tar pitch is an important component in the formulation of coal tar primer, coal tar enamel and other coal tar pipe coatings.