LD50

That dose of a compound which causes death in 50% of the organisms to which it has been administered. Routine use of LD50 tests is now being replaced by more sensitive (and less wasteful) methods.

LD50

The value of a given experimental variable required to cause 50% mortality.
Found on http://life.bio.sunysb.edu/marinebio/glossary.lmn.html

LD50

Stands for lethal dose 50, an index of acute toxicity established by dosing animals (usually rats) until 50% of the test population dies. Doses may be established for oral, dermal or inhalation exposures eg LE50(concentration).
Found on http://www.encyclo.co.uk/local/20474

LD50

Lethal dose of a substance that will kill 50% of all organisms exposed to that dose.
Found on http://www.roadsafeeurope.com/useful_info/Glossary

LD50

median lethal dose.
Found on http://www.encyclo.co.uk/local/21001

LD50

Median Lethal Dose. Statistically derived single dose that can be expected to cause death in 50% of dosed animals
Found on http://www.encyclo.co.uk/local/21114

LD50

n. median lethal dose; a quantity or concentration of toxin at which half of the test subjects to whom it is administered are killed by its effects
Found on http://www.avru.org/reference/reference_glossary.html

Ld50

The value of a given experimental variable required to cause 50% mortality.
Found on http://www.superglossary.com/Glossary/Science/Marine_Biology/

LD50

Dose required to kill 50% of laboratory test animals.
Found on http://urbanext.illinois.edu/veggies/glossary.cfm

LD50

Dose which kills half of the tested population.
Found on http://www.cat-world.com.au/glossary

LD50

See LDn
Found on https://sis.nlm.nih.gov/enviro/iupacglossary/annex1.html

LD50

(lethal dose 50) The dose at which 50% of laboratory animals die within days to weeks.
Found on http://experttoxicologist.com/tcas-glossary.aspx
No exact match found