| C/N | carbon/nitrogen [ratio]; carrier/ noise [ratio] |
|---|---|
| AR | absolute risk; accounts receivable; achievement ratio; actinic reticuloid [syndrome]; active resista... |
| L/S | lactase/sucrase [ratio]; lecithin/ sphingomyelin [ratio]; lipid/saccharide [ratio]; longitudinal sec... |
| CNR | cannabinoid receptor; Center for Nursing Research; contrast-to-noise ratio; Council of Nurse Researc... |
| NR | do not repeat [Lat. non repetatur]; nerve root; neural retina; neutral red; noise reduction; nonreac... |