Definition of LD in English:


Syllabification: LD


  • 1North American Learning disabled.
  • 1.1Lethal dose (of a toxic compound, drug, or pathogen). It is usually written with a following numeral indicating the percentage of a group of animals or cultured cells or microorganisms killed by such a dose, typically standardized at 50 percent ( LD50).
    More example sentences
    • That's all well and good, but how do you attach significance to the LD50 numbers that you might find?
    • The LD50 test does not account for drug interactions, and is therefore of little use in such cases.
    • Special calculations are used when translating animal LD50 values to possible lethal dose values for humans.

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