LD 50/ Lethal Dose
The dose of a toxicant or microbe that will kill 50 percent of the test organisms within a designated period. The lower the LD 50, the more toxic the compound.
Source: Terms of the Environment ...
Lethal Dose 50: Also referred to as LD50, the dose of a toxicant that will kill 50 percent of test organisms within a designated period of time; the lower the LD 50, the more toxic the compound.
lethal dose 50% (LD50) The dose of a chemical taken by mouth or absorbed by the skin which is expected to cause death in 50% of the test animals so treated; lethal dose.
Lethal Dose (LD): amount of a substance required to cause death in an organism.
Loading: amount of a substance entering the environment (soil, water, or air).
median lethal dose (LD50)
Statistically derived median dose of a chemical or physical agent (radiation) expected to kill 50% of organisms in a given population under a defined set of conditions.
Lethal dose low; the lowest dose in an animal study at which lethality occurs.
Leachate ...
Ldlo- Lethal dose low; the lowest dose in an animal study at which lethality occurs.
Absolute lethal dose (LD100)-Lowest amount of a substance which kills 100% of test animals under defined conditions. This value is dependent on the number of organisms used in its assessment. (IUPAC) ...
Median Lethal Dose or LD50 In toxicology, median lethal dose or Lethal Dose 50% (LD50) is the amount of radiation or any other toxic substance that can kill half the members of a test population.
This is called the LD50 (Lethal Dose 50%) test of toxicity. In this experiment the LD50 value for many different household substances have been calculated.
to compare an animal's daily dietary intake of a pesticide to its LD50 value. A ratio greater than 1.0 indicates that the animal is likely to consume a dose amount that would kill 50 percent of animals of the same species. (See> LD50/Lethal Dose.) ...
 See also: Lethal, Dose, Toxic, Water, Environment
  
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