nor-
a chemical prefix denoting either (a) a compound of normal structure (having an unbranched chain of carbon atoms) that is isomeric with one having a branched chain, or (b) a compound whose chain or ring contains one less methylene (CH2) group than that of its homologue.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
nor-
1. Chemical prefix denoting 1) elimination of one methylene group from a chain, the highest permissible locant being used; 2) contraction of a (steroid) ring by one CH2 unit, the locant being the capital letter identifying the ring. Elimination of two methylene groups is denoted by the prefix dinor-; three groups, by trinor-, for example, norleucine.
2. Chemical prefix denoting "normal," that is, unbranched chain of carbon atoms in aliphatic compounds, as opposed to leucine, a branched chain with the same number of carbon atoms.
Farlex Partner Medical Dictionary © Farlex 2012
nor-
Chemical prefix denoting: 1. Elimination of one methylene group from a chain, the highest permissible locant being used. 2. Contraction of a (steroid) ring by one CH2 unit, the locant being the capital letter identifying the ring. Elimination of two methylene groups is denoted by the prefix dinor-; three groups, by trinor-. 3. Chemical prefix denoting "normal," i.e., unbranched chain of carbon atoms in aliphatic compounds, as opposed to branched with the same number of carbon atoms; e.g., norleucine, leucine.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
nor-
Chemical prefix denoting: 1. Elimination of one methylene group from a chain, the highest permissible locant being used. 2. Contraction of a (steroid) ring by one CH2 unit. 3. Chemical prefix denoting "normal," i.e., unbranched chain of carbon atoms in aliphatic compounds.
Medical Dictionary for the Dental Professions © Farlex 2012