lethal dose

World English Dictionary
lethal dose
 
n
See also median lethal dose LD the amount of a drug or other agent that if administered to an animal or human will prove fatal

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American Heritage
Medical Dictionary

lethal dose n.
Abbr. LD
The dose of a chemical or biological preparation that is likely to cause death.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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