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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I. abbreviation

1. [Latin laus Deo] praise be to God

2. left defense

3. lethal dose

4. line of departure

5. line of duty

6. local delivery

7. long delay

8. long distance

II. abbreviation

learning disability; learning disabled herein

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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)