rachitis
1. rickets. 2. inflammatory disease of the vertebral column.
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rachitogenic
causing rickets.
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rachitomy
the surgical or anatomical opening of the spinal canal.
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racing
contests of speed and endurance with serious biochemical and physiological consequences lessened by adequate training beforehand. See also physical fitness, exertional rhabdomyolysis, heat exhaustion, pulmonary hemorrhage, epistaxis, exhaustion.
r. dogs usually refers to Greyhounds and Whippets, but in some instances may be used to describe the dogs used for endurance sledge racing.
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rack
a fast, four beat artifical (taught) gait of horses, similar to the running walk and slow gait, but with more up and down movement. Performed by the five-gaited American saddle horse.
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Racosperma melanoxylon
see acacia melanoxylon.
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Racosperma salicinum
see acacia salicina.
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rad
1. acronym for radiation absorbed dose; a superseded, non-SI unit of measurement of the absorbed dose of ionizing radiation. It corresponds to an energy transfer of 100 ergs per gram of any absorbing material (including tissue). The biological effect of 1 rad of radiation varies with the type of radiation. When the dose is in rem, all types have the same biological effect. Now replaced by the gray... |
rad.
[L.] radix (root).
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radar tracking
an electronic technique used to follow the flight of birds.
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