(medicine, of a prescription medication) Outside of regulatorily approved indications, but (unless otherwise specified) within the bounds of reasonable use as defined by a licensed prescriber.

The round sticker in the centre of a phonograph record that contains the record company's logo and information about the recording. / (by extension) The record company itself, as identified by its logo.

(physics, chemistry) An organic compound, containing an unpaired electron spin, that can be bonded to a molecule under investigation so as to be analysed using electron spin resonance spectroscopy

plural of designer label

Of or pertaining to the use of a drug in a way or for a purpose not specified on the label, or specifically the information provided by the manufacturer.

plural of charity label

plural of spin label

(chemistry, American spelling) Water where both the hydrogen and oxygen atoms have been replaced by less common isotopes.