Search Details
Word: half-life
(lookup usage)
(lookup stats)
Meaning:
Noun:
- chemistry In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.
- medicine The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity.
- physics The time required for half of the nuclei in a sample of a specific isotope to undergo radioactive decay.
- The time it takes for an idea or a fashion to lose half of its influential power.
Source: Wiktionary
| Src Info »