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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

(tahr) a dark-brown or black, viscid liquid obtained from various species of pine or from bituminous coal (coal t.). It is used for topical treatment of skin conditions, including eczema, psoriasis, and dandruff, but is toxic and carcinogenic by inhalation or ingestion.

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

[tär]
Etymology: AS, teoru
a dark, viscid organic mixture produced by the distillation of coal, wood, or vegetable matter. Some forms of tar are used to treat eczema and other skin disorders.

TAR

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

Achilles tendon rupture

; TAR loss of TA continuity due to trauma or as the endpoint of untreated Achilles tendinitis, presenting as an acute, chronic or acute on chronic condition
  • acute TAR rupture of the TA 2-5 cm superior to its insertion; characterized by immobility, severe pain, bruising, swelling and a palpable 'dip' in tendon continuity; the patient cannot plantarflex the ankle joint; single-leg raise and Thompson's tests are positive; immediate first-aid treatment includes RICE(P) and immobilization, with non-steroidal anti-inflammatory drugs beginning 48-72 hours postinjury; most cases require surgery to reapproximate the separated tendon and immobilization (with the ankle joint at 90°) for 4-6 weeks, then a further 4-6 weeks of intensive physiotherapy


coal tar

petrochemical derivative with anti-inflammatory properties used as an ointment, paste or bath lotion in the topical treatment of inflammatory skin conditions, e.g. psoriasis, eczema; as 1-10% coal tar in soft paraffin (effective, but poorly tolerated by patients); coal tar preparations include: calamine and coal tar ointment BP; coal tar and salicylic acid ointment BP; coal tar paste BP; zinc and coal tar paste BP

tar

a dark-brown or black, viscid liquid obtained from various species of pine or from bituminous coal. See also wood tar derivatives.

coal tar
coal tar pitch
tar derivatives
include phenol (carbolic acid), cresols, creosote, all potent poisons. See also wood tar derivatives.
hot tar
a cause of burns in dogs and cats, usually made more severe because it sticks to the skin.
juniper tar
a volatile oil obtained from wood of Juniperus oxycedrus; used topically in the treatment of skin disease.
pine tar
a product of destructive distillation of the wood of various pine trees; used as a rubefacient and treatment for skin disease.
tar pitch
Stockholm tar