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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