half-life is a topic covered in the Taber's Medical Dictionary.

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(haf′līf″ )

1. The time required for half the nuclei of a radioactive substance to lose their activity by undergoing radioactive decay.
2. In biology and pharmacology, the time required by the body, tissue, or organ to metabolize or inactivate half the amount of a substance taken in. This is an important consideration in determining the proper amount and frequency of drug administration.

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