| Nadi reaction | Formation of indophenol blue by the action of an oxidizing enzyme present in certain cells and tissues when they are treated with a solution of alpha-naphthol and dimethylparaphenylenediamine; by this method, cells of the myelocyte series, which give a positive reaction, may be distinguished from those of the lymphocyte series, which give a negative reaction; endothelial leukocytes give a variable reaction, probably positive when they have phagocytised the debris of myeloid cells. Synonym: Nadi reaction. (05 Mar 2000) |
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| nadide | 3-Carbamoyl-1-beta-d-ribofuranosylpyridinium hydroxide;a nicotinamide adenine dinucleotide compound used as an antagonist to alcohol and narcotics. (05 Mar 2000) |
| nadir | The lowest point, point of greatest adversity or despair. (18 Nov 1997) |