| triple r. (of Lewis) |
a physiologic reaction of the skin to stroking with a blunt instrument: first a red line develops at the site of stroking, owing to the release of histamine or a histaminelike substance, then a flare develops around the red line due to vasodilation, and finally a wheal is formed as a result of local edema.
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| triple s. |
staining with three different dyes to facilitate identification of the different elements.
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| triple sugar iron (TSI) agar |
an agar medium containing peptone, lactose, sucrose, glucose, ferrous ammonium sulfate, sodium thiosulfate, sodium chloride, and phenol red, used for the preliminary screening of Enterobacteriaceae. Production of hydrogen sulfide causes the formation of black ferrous sulfide along the stab line, gas production causes bubbles in the agar, and fermentation of the sugars is indicated by the amount of acid produced.
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| triple v. |
triplopia.
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| triple-A s. |
Allgrove's s.
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