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Half Life

see synonyms of half life

Noun

1. half life, half-life

the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)

WordNet Lexical Database for English. Princeton University. 2010.

Half Life

see synonyms of half life
noun
1. 
the time taken for half of the atoms in a radioactive material to undergo decay
. Symbol: τ
2. 
the time required for half of a quantity of radioactive material absorbed by a living tissue or organism to be naturally eliminated (biological half-life) or removed by both elimination and decay (effective half-life)

Collins English Dictionary. Copyright © HarperCollins Publishers

Half Life

see synonyms of half life
noun
the constant time period required for the disintegration of half of the atoms in a sample of some specific radioactive substance
: also half life

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

Half Life

see synonyms of half life
n.
1. Physics The time required for half the nuclei in a sample of a specific isotopic species to undergo radioactive decay.
2. Biology
a. The time required for half the quantity of a drug or other substance deposited in a living organism to be metabolized or eliminated by normal biological processes. Also called biological half-life.
b. The time required for the radioactivity of material taken in by a living organism to be reduced to half its initial value by a combination of biological elimination processes and radioactive decay.

The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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