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   half-life

   /ˈhɑːflʌɪf/

   noun

   • 1. the time taken for the radioactivity of a specified isotope to fall to half its original value: "iodine-131 has a half-life of 8.1 days"
   • ▪ the time required for any specified property (e.g. the concentration of a substance in the body) to decrease by half.

   Scrabble Points: 17

   • H

     4

   • A

     1

   • L

     1

   • F

     4

   • -

   • L

     1

   • I

     1

   • F

     4

   • E

     1

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