nerve gas

any of several poison gases, derived chiefly from phosphoric acid, that weaken or paralyze the nervous system, especially that part of the system controlling respiration.

1935–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nerve gas
(esp in chemical warfare) any of various poisonous gases that have a potentially fatal paralysing effect on the central nervous system

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Main Entry:  nerve gas
Part of Speech:  n
Definition:  a poisonous gas that is absorbed into the body and paralyzes or kills through its effects on the nervous and respiratory system's 21st Century Lexicon
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American Heritage
Medical Dictionary

nerve gas n.
Any of various poisonous gases that interfere with the functioning of nerves by inhibiting cholinesterase.

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
nerve gas  
Any of various poisonous gases that interfere with the functioning of nerves by inhibiting the breakdown of the neurotransmitter acetylcholine. Increased levels of acetylcholine stimulate the parasympathetic nervous system, leading to cardiac and respiratory arrest.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Topic areas students could explore include: hazards in the workplace, toxic chemicals, and nerve gas structures.
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