n :  a usu. radioactive isotope used in labeling
, vt, la*beled  or  la*belled  la*bel*ing  or  la*bel*ling   1  :  to distinguish (an element or atom) by using an isotope distinctive in some manner (as in mass or radioactivity) for tracing through chemical reactions or biological processes  2  :  to distinguish (as a compound or cell) by introducing a traceable constituent (as a dye or labeled atom) .
 
 
 
Similar sounding terms:  la·bi·al  la·bile  lo·be·lia  lob·ule 
 
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