rote-none

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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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary

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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10

Rote-none is always a great word to know.

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a fool or simpleton; ninny.

a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.

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"Cassius is aweary of the world:
Hated by one he loves; braved by his brother;
Checked like a bondman; all his faults observed,
Set in a notebook, learned and conned by rote
To cast into my teeth."

-Shakespeare

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