label

²label

vt

la·beled or la·belledla·bel·ing or la·bel·ling \ˈlā-b(ə-)liŋ\

Definition of LABEL

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)