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]

The Collaborative International Dictionary of English. 2000.

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