ninhydrin

[nin-hahy-drin]
noun Chemistry.
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.

Origin:
< German, registered as a trademark for the drug in 1912

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World English Dictionary
ninhydrin (nɪnˈhaɪdrɪn)
 
n
a chemical reagent used for the detection and analysis of primary amines, esp amino acids, with which it forms a derivative with an intense purple colour
 
[C20: from the chemical name triketo hydrindene]

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American Heritage
Medical Dictionary

ninhydrin nin·hy·drin (nĭn-hī'drĭn)
n.
A poisonous crystalline oxidizing agent used as an analytic reagent.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
Ninhydrin also reacts with amino acids in latent print residue.
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