| 1. | Chemistry. levo-. |
| 2. | U.S. Military. (in designations of light aircraft) liaison: L-15. |
| l- The symbol for levorotatory. |
| L- In biochemistry, a symbol used as a prefix to indicate the spatial configuration of certain organic compounds with asymmetric carbon atoms. It is used if an organic compound has a configuration about an asymmetric carbon atom analogous to that of L-glyceraldehyde (the arbitrarily chosen standard), in which the hydroxy (OH) functional group is on the left side of the asymmetric carbon atom: an L-amino acid. [From l(evorotatory).] |
le·vo·ro·ta·to·ry  (lē'və-rō'tə-tôr'ē, -tōr'ē)  adj. Symbol l- Of or relating to an optically active chemical that rotates the plane of polarized light to the left, or counterclockwise: Only levorotatory amino acids are biologically active. |
L- pref.
Relating to the configuration of l-glyceraldehyde, a compound chosen as the basis for stereochemical nomenclature because it is the simplest carbohydrate that can form optical isomers: l-lactic acid.
l- pref. l-
To the left; levo: l-lactic acid.