paraquats

paraquat

[par-uh-kwaht]
noun Chemistry.
a toxic herbicide, C 1 2 H 1 4 N 2 ⋅2CH 3 SO 4 , applied to food and flower crops and to highway borders as a defoliant and weed-killer.

Origin:
1960–65; para-1 + quat(ernary), in reference to the bond between the two pyridyl groups, which is in the para position with respect to their quaternary nitrogen atoms

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Collins
World English Dictionary
Paraquat (ˈpærəˌkwɒt)
 
n
trademark a yellow extremely poisonous soluble solid used in solution as a weedkiller

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

paraquat
quick-acting herbicide, 1961, from para- (q.v.) + quat(ernary).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

paraquat par·a·quat (pār'ə-kwŏt')
n.
A colorless compound or a related yellow compound used as a herbicide.

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
paraquat   (pār'ə-kwŏt')  Pronunciation Key 
A toxic compound used as a herbicide, especially in its colorless, dichloride form (C12H14Cl2N2) or in its yellow, bismethyl sulfate form (C14H20N2O8S2). Paraquat is used primarily to control grass and weeds. Its use in the United States is restricted because of its high level of toxicity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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