rotenone

[roht-n-ohn]
noun Chemistry, Pharmacology.
a white, crystalline, water-insoluble, poisonous heterocyclic compound, C 2 3 H 2 2 O 6 , obtained from derris root: used chiefly as the active ingredient of certain insecticides and in medicine in the treatment of chiggers and scabies.

Origin:
1920–25; roten- (said to be < Japanese) + -one

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rotenone (ˈrəʊtɪˌnəʊn)
 
n
a white odourless crystalline substance extracted from the roots of derris: a powerful insecticide. Formula: C23H22O6; relative density: 1.27; melting pt: 163°C
 
[C20: from Japanese rōten derris + -one]

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Rotenone is a critical tool in maintaining the wild heritage brook trout fishery.
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