an administrative division in N China. 25,640 sq. mi. (66,400 sq. km).
[nin-hahy-drin] /nɪnˈhaɪ drɪn/ noun, Chemistry. 1. a white or yellow, toxic, crystalline or powdery compound, C 9 H 4 O 3 ⋅H 2 O, that reddens when heated above 100°C, a monohydrate, soluble in water or alcohol: used primarily as a reagent to detect the presence of various amino acids. /nɪnˈhaɪdrɪn/ noun 1. a chemical […]
- Ninhydrin reaction
ninhydrin reaction n. A test for proteins, peptones, peptides, and amino acids possessing free carboxyl and alpha-amino groups in which ninhydrin reacts with such compounds to produce a blue color.
/ˈnɪnjən/ noun 1. Saint. ?360–?432 ad, the first known apostle of Scotland; built a stone church (candida casa) at Whithorn on his native Solway; preached to the Picts. Feast day: Sept 16
[nee-nib] /ˈni nɪb/ noun, Obsolete. 1. .