ld

abbr. lethal dose, usu. with a following numeral indicating the percentage of a group of animals killed by such a dose (LD50).

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abbreviation

1. land

2. lead

3. limited

4. load

5. lord

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1. praise (be) to God. [ < L laus Deo]

2. learning disability.

3. learning-disabled.

4. lethal dose.

5. long distance (telephone call).

6. Low Dutch.

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abbrev

1. Lady Day

2. Lethal dosage

3. Low Dutch

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ld.,

1. land.

2. limited.

Ld.,

1. limited.

2. lord.

LD (no periods),

1. lethal dose.

2. Low Dutch.

3. learning disability.

L.D. or LD.,

Low Dutch.

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abbr.

■ learning disabled

■ lethal 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)