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(tap′ing) [1tap] Percussion (3).

muscle t. Tapping the skin over the belly of a muscle to recruit more motor units and facilitate contraction. It is usually performed manually over muscles weakened from neurological injury.


(tap′ing) [2tap] The withdrawal of fluid from a body cavity. Examples include paracentesis and thoracentesis.


(tar) A dark, viscid mass of complex chemicals obtained by destructive distillation of tobacco, coal, shale, and organic matter, esp. wood from pine and juniper trees.

coal t. A tar produced in the destructive distillation of bituminous coal. It is used as an ingredient in ointments for treating eczema, psoriasis, and other skin diseases.


(tă-ranch′ŭ-lă) [L. tarantula fr Italian tarantola fr Taranto, an Italian seaport in on the Gulf of Taranto] A large venomous spider of the family Theraphosidae. It is feared by many people, but its bite is comparable in severity to a bee sting. SEE: spider bite; Theraphosidae.


(tar′dĭv) [Fr. tardive, tardy] Delayed, esp. pert. to a disease in which the characteristic sign or symptom appears late in the course of the disease. SEE: tardive dyskinesia.


(tār) The weight of an empty container. That weight is subtracted from the total weight of the vessel and substance added to it in order to determine the precise weight of the material added to the container.


(tārd) A container of known and predetermined tare.


(tar′gĕt) [Fr. targette, small shield] 1. A structure or organ to which something is directed. 2. The part of the anode of an x-ray or therapeutic tube in which electrons from the filament or electron gun are focused and x-ray photons are produced. It is usually made of a heavy metal such as tungsten or molybdenum.


(tar′nish) Surface discoloration or reduced luster of metals owing to the effect of corrosive substances or galvanic action. In dental restorations, such action may be enhanced by accumulation of bacterial plaque.


(tar′săl) [ tarsus + -al] 1. Pert. to the tarsus or supporting plate of the eyelid. 2. Pert. to the ankle or tarsus.

tarsal tunnel syndrome

(tar′săl) Neuropathy of the distal portion of the posterior tibial nerve at the ankle caused by chronic pressure on the nerve at the point it passes through the tarsal tunnel. It causes pain in and numbness of the sole of the foot and weakness of ...

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