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Sig.(2) (iou)



Sig. verb imper. L19.
[Abbreviation of Latin signa (lit. 'label it') imper. sing., or signetur (lit. 'let it be labelled') 3rd person sing. pres. subjunct. pass., of signare SIGN verb.]
Medicine. As an instruction to a pharmacist on a prescription: mark (medication etc.) with the following directions for use.