[1] : WordNet (r) 2.0

half life
     n : 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 syn: half-life
see also:
half-life 

[2] : Moby Thesaurus II by Grady Ward, 1.0

19 moby thesaurus words for "half life":
   activity, artificial radioactivity, contamination, curiage,
   decontamination, fallout, natural radioactivity, nuclear radiation,
   radiant energy, radiation, radioactive radiation, radioactivity,
   radiocarbon dating, radiolucency, radiopacity, radiosensibility,
   radiosensitivity, saturation point, specific activity

Half Life >> H Words
Half Life, definition of term: Half Life
half+life_pag1.html

Half >> H Words
Half, definition of term: Half
half_pag1.html

Half Tide >> H Words
Half Tide, definition of term: Half Tide
half+tide_pag1.html

Half Sole >> H Words
Half Sole, definition of term: Half Sole
half+sole_pag1.html

Half Year >> H Words
Half Year, definition of term: Half Year
half+year_pag1.html

Half Tone >> H Words
Half Tone, definition of term: Half Tone
half+tone_pag1.html

Half Truth >> H Words
Half Truth, definition of term: Half Truth
half+truth_pag1.html

Half Sister >> H Words
Half Sister, definition of term: Half Sister
half+sister_pag1.html

Half Way >> H Words
Half Way, definition of term: Half Way
half+way_pag1.html

Half Note >> H Words
Half Note, definition of term: Half Note
half+note_pag1.html

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