| applicator | A slender rod of wood, flexible metal, or synthetic material, at one end of which is attached a pledget of cotton or other substance for making local applications to any accessible surface. Origin: L. Ap-plico, to attach to (05 Mar 2000) |
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| radio label | A mildly radioactive molecule that is used to tag another molecule (such as a protein) so that it can be identified as it goes through some kind of biochemical process. (09 Oct 1997) |
| chromogenic label | A molecule which can be used as a label to a biological probe molecule because it forms a coloured compound when the probe molecule is attached to its target. (09 Oct 1997) |
| off-label | Use of a drug for a disease or condition other than the indication for which it was approved by the FDA. For example: many doctors prescribe paromomycin (humatin) for cryptosporidiosis, although it is not approved for treating this disease. (09 Oct 1997) |
| off-label use | In the United States, the regulations of the Food and drug administration (FDA) permit physicians to prescribe approved medications for other than their intended indications. This practice is known as off-label use. (12 Dec 1998) |
| open-label trial | A study in which both researchers and participants know what drug a person is taking and at what dose. (09 Oct 1997) |
| label | 1. To incorporate into a compound a substance that is readily detected, such as a radionuclide, whereby its metabolism can be followed or its physical distribution detected. 2. The substance so incorporated. (05 Mar 2000) |
| fluorescent label | A molecule which fluoresces and can be attached to a probe molecule that does not fluoresce. (09 Oct 1997) |