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see tar and pitchtar and pitch,
viscous, dark-brown to black substances obtained by the destructive distillation of coal, wood, petroleum, peat, and certain other organic materials. The heating or partial burning of wood to make charcoal yields tar as a byproduct and is an ancient method for the
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a black viscous substance obtained after distilling the fuel and oil fractions from petroleum. The yield of tar from various petroleums is 15–30 percent based on the petroleum. The main components of tar are oil not distilled during the fractionation of petroleum, petroleum resins, solid asphaltic substances (asphaltenes. carbenes, and carboids), and substances of an acidic nature (asphaltogenic acids and their anhydrides). Tar has a density of 0.95–1.0g/cm3 and a viscosity of 18°-45° of conventional viscosity at 100° C.

Tar containing a considerable amount of oil fractions is called semitar; its viscosity is 18°-25° of conventional viscosity and its flash point, 140° C. Tar is also the name for concentrated residues of petroleum oil (petroleum tar) that undergo multistage refining processes to obtain high-quality motor oils. The residues obtained after the sulfuric acid refining of petroleum products are called acid tars.

Tar is used to prepare petroleum bitumens and in road construction. Semitar is used to lubricate coarse mechanisms. Oil tars are used as plasticizers in the rubber industry and in construction. Cracking and destructive hydrogenation can be used to convert very viscous tars into gasoline, diesel fuel, and other substances.


Nametkin, S. S. Khimiia nefti [3rd ed.]. Moscow. 1955.
Nefteprodukty: Svoislva, kacheslvo, primennie. Spravochnik. Moscow, 1966.



a liquid product of the dry distillation of solid fuels, such as coal and lignite, shales, wood, and peat. The consistency of tar varies from a readily mobile liquid to a mass that flows with difficulty; it is usually dark brown, but it can be almost black. Tar is a complex mixture of organic compounds; its composition depends on the initial material and the method of treatment. The low-temperature (500°-600°C) dry distillation of coal or peat—that is, semicoking—yields so-called primary tar. The coking of coal yields coal tar. The tar formed by heat treating wood is called wood tar.



(1) A plucked stringed instrument used in the Caucasus. The tar has an overall length of approximately 900–1,000 mm. It has three pairs of melody strings (or three pairs and one single string) and two pairs of drone strings.

(2) In Arab countries, a small tambourine.


A viscous material composed of complex, high-molecular-weight compounds derived from the distillation of petroleum or the destructive distillation of wood or coal.

coal-tar pitch, tar

A dark brown to black hydrocarbon obtained by the distillation of coke-oven tar; softening point near 150°F (65°C); used in built-up roofing as a waterproofing agent.


1. any of various dark viscid substances obtained by the destructive distillation of organic matter such as coal, wood, or peat
2. another name for coal tar


(file format)
("Tape ARchive", following ar) Unix's general purpose archive utility and the file format it uses. Tar was originally intended for use with magnetic tape but, though it has several command line options related to tape, it is now used more often for packaging files together on other media, e.g. for distribution via the Internet.

The resulting archive, a "tar file" (humourously, "tarball") is often compressed, using gzip or some other form of compression (see tar and feather).

There is a GNU version of tar called gnutar with several improvements over the standard versions.

Filename extension: .tar

MIME type: unregistered, but commonly application/x-tar

Unix manual page: tar(1).

Compare shar, zip.


(Tape ARchive) A Unix utility that is used to archive files by combining several files into one. It is often used in conjunction with the "compress" or "gzip" commands to compress the data. The name came from the days when magnetic tape was the predominant storage medium rather than disk. Tar archives are often called "tarballs." See archive formats.
References in periodicals archive ?
I do not like being tarred with the same brush as Jimmy Savile if he has been doing this.
But there were a lot of players who weren't out at all, so they shouldn't be tarred with the same brush.
They are now tarred with the same brush and both parties will be judged for their actions against the people of this country in next month's local elections.
Some hope - they appear to be all tarred with the same brush.
COUNCILLOR JOHN McPARTLAND, Labour, Middlehaven wardI WOULD like to wish Cllr McIntyre's chihuahua a speedy recovery, but all Dogue de bordeaux shouldn't be tarred with the same brush.
I find it most objectionable to be tarred with the same brush as greedy, deceitful, scroungers whether they are in Parliament or not.
I amalso fed up of being tarred with the same brush as some of these "kings on Saturday night/b***er-all Sunday morning" town drivers that unfortunately do operate in our city.
The GCC cannot afford to be tarred with the same brush as other emerging markets and it is important for companies such as EII to set this benchmark in ethical business practice in order to portray the correct image of the Middle East.
They don't deserve to be tarred with the same brush as those who obviously have no interest in anything but their own idiotic antics.
The problem for the millions of animal rights supporters like myself now, is that the public are brainwashed into thinking we are all tarred with the same brush.
But they also fail local governments across the country, which find themselves tarred with the same brush of unprofessionalism.
But the decision has caused anger because all the pupils at the town's Redhill School were tarred with the same brush.