| 单词 | half-life |
| 释义 | half-life /haf"luyf', hahf"-/, n. , pl. half-lives /-luyvz'/. 1. Physics. the time required for one half the atoms of a given amount of a radioactive substance to disintegrate. 2. Pharm. the time required for the activity of a substance taken into the body to lose one half its initial effectiveness. 3. Informal. a brief period during which something flourishes before dying out. Also, half life, halflife. Also called half-life period. [1905-10; HALF + LIFE] |
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