noun Chemistry.
a light tan, crystalline, water-insoluble, poisonous solid, C 12 H 8 OCl 6 , used as an insecticide: manufacture and use have been discontinued in the U.S.

1945–50; Diel(s-Al)d(e)r (reaction) + -in2

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World English Dictionary
dieldrin (ˈdiːldrɪn)
a crystalline insoluble substance, consisting of a chlorinated derivative of naphthalene: a contact insecticide the use of which is now restricted as it accumulates in the tissues of animals. Formula: C12H8OCl6
[C20: from Diel(s-Al)d(e)r (reaction) + -in]

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American Heritage
Medical Dictionary

dieldrin di·el·drin (dī-ěl'drĭn, dēl'-)
A chlorinated hydrocarbon used as an insecticide and in mothproofing.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
dieldrin   (dēl'drĭn)  Pronunciation Key 
A light tan, toxic, carcinogenic compound used as an insecticide on fruit, soil, and seed, and in controlling tsetse flies and other carriers of tropical diseases. Chemical formula: C12H8Cl6O.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They are discussed together in this fact sheet because aldrin quickly breaks down to dieldrin in the body and in the environment.
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