One of the mysteries of the English language finally explained.
1North American Learning disability (or disabled).
2Lethal 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 per cent (LD₅₀).
- ‘You may obtain the LD50 number by contacting the manufacturer at the phone number listed on the pesticide label.’
- ‘That's all well and good, but how do you attach significance to the LD50 numbers that you might find?’
- ‘Special calculations are used when translating animal LD50 values to possible lethal dose values for humans.’
- ‘The only figure of real interest is the subcutaneous LD50 as few snakes can ever achieve anything other than that.’
- ‘The LD50 test does not account for drug interactions, and is therefore of little use in such cases.’
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