Redness, as one of the four signs of inflammation (r., calor, dolor, tumor) enunciated by Celsus. [L.]
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ru·bor 'rü-.bȯr n redness of the skin (as from inflammation)
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n.
redness: one of the classical signs of inflammation in a tissue, the other three being calor (heat), dolor (pain) and tumor (swelling). The redness of inflamed tissue is due to the increase in size of the small blood vessels in the area, which therefore contain more blood.
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ru·bor (rooґbor) [L.] redness, one of the cardinal signs of inflammation.Medical dictionary. 2011.