TAR

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

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thoracic aortic rupture; thrombocytopenia with absent radii [syndrome]; tissue-air ratio; total abortion rate; transactivation response; transanal resection; transaxillary resection; treatment authorization request

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tar 'tär n

1) any of various dark brown or black bituminous usu. odorous viscous liquids obtained by destructive distillation of organic material (as wood, coal, or peat) esp one used medicinally (as to treat skin diseases) see coal tar, JUNIPER TAR, pine tar

2) a substance in some respects resembling tar esp a condensable residue present in smoke from burning tobacco that contains combustion by-products (as resins, acids, phenols, and essential oils)

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(tahr) a dark brown or black viscid liquid, obtained by roasting the wood of various species of pine, or as a by-product of the destructive distillation of bituminous coal (see coal t.). It is a mixture of complex composition, and is the source of organic substances such as cresol, creosol, guaiacol, naphthalene, paraffin, phenol, toluene, and xylene. Once used in chronic bronchitis, diarrhea, and diseases of the urinary organs, it now has only limited use in certain skin diseases, notably psoriasis and chronic eczematous disorders. If it is ingested or its fumes are inhaled, it is toxic and carcinogenic. See also pitch and pitch poisoning.