'Mes-' definitions:
Definition of 'Mes-'
From: GCIDE
- Meso- \Mes"o-\, Mes- \Mes-\ [Gr. me`sos in the middle.]
- 1. A combining form denoting in the middle, intermediate. [1913 Webster]
- 2. specif. (Chem.), Denoting a type of hydrocarbons which are regarded as methenyl derivatives. Also used adjectively. [1913 Webster]
- 3. (Chem.) Optically inactive due to compensating optical activity at two or more asymmetric centers, often due to a plane of symmetry within the molecular structure; as, meso-tartaric acid. [PJC]
- 4. Attached to a carbon atom located between two hereoatoms in a heterocyclic ring. [PJC]