tar


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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 ?
"ODEQ, alongside our partners at EPA and the Quapaw Tribe, continues to work toward solutions in the Tar Creek area for the betterment of citizens' lives and the environment," said Oklahoma DEQ Executive Director Scott Thompson.
Wee said if Lim insisted on keeping politics out of education, the latter should establish PH's tertiary institution as a community-based university and use his ministerial power to provide it with an annual grant so that its tuition fees can be lower than that of TAR UC.
Thomas Gricks is an e-discovery lawyer who was involved in one of the early landmark cases about using TAR in litigation.
Azami said that mineral tar would be excluded from the new restrictions.
The researchers have proposed three tar production methods that could have been developed by Neanderthals.
Coal tar is a by-product from the pyrolysis of coal to produce coke for the steel industry, and widely used as raw materials in organic chemical [1, 2].
Caption: "Polish Landscape II (Auschwitz)," latex and tar on tile over Masonite (Jan, 5, 1990).
Thrombocytopenia absent radius (TAR) syndrome is a rare genetic condition, characterized by bilateral absence of the radii while both thumbs are present, and thrombocytopenia.
Visitors to the La Brea Tar Pits can see--and smell--the large, muddy-looking tar pits around the property.
Thus, low-grade coal in this research's aim and Mo[S.sub.2] catalyst were used separately in a dual-stage reactor having two sections through atmospheric pressure for the enhancement of coal pyrolysis tar. Moreover, the catalytic effect of Mo[S.sub.2] on coal tar quality in terms of distilled temperature difference was investigated and also the behavior of catalytic upgrading in the conversion of heavy tar components was studied.
This report provides detailed analysis of worldwide markets for Coal Tar Pitch from 2011-2016, and provides extensive market forecasts (2016-2021) by region/country and subsectors.
Of particular concern are the sealcoat products based on use of coal tar emulsions, experts say.