[noor-oh-tok-sin, nyoor-, noor-oh-tok-, nyoor-]
a neurotoxic substance, as rattlesnake venom or the poison of a black widow spider.

1900–05; neuro- + toxin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
neurotoxin (ˌnjʊərəʊˈtɒksɪn)
any of several natural substances that interfere with the electrical activities of nerves, thus preventing them from functioning

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

neurotoxin neu·ro·tox·in (nur'ō-tŏk'sĭn, nyur'-)
See neurolysin.

neu'ro·tox'ic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But health experts say it is a potent neurotoxin that can have lasting health
Mandating further emission cuts, it argued, would not solve the problem of
  human exposure to the neurotoxin.
It's in tobacco, it's a nerve toxin, it's a neurotoxin.
The government also admits that it is a potent neurotoxin and can cause
  personality changes.
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