Medical Definition of label
labeled or labelled; labeling or labelling \ˈlā-b(ə-)liŋ\play
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)
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