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Noun: half life  hãf lIf
  1. 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)
    - half-life

Derived forms: half-lives

Type of: period, period of time, time period, time span

Encyclopedia: Half life

Nearest

half brother
half cross stitch
half crown
half dollar
half door
half dozen
half eagle
half gainer
half hatchet
half hitch
half life
half mask
half mile
half nelson
half note
half page
half pound
half rest
half sister
half snipe
half sole