meso-

1 definition found

meso- - Collaborative International Dictionary of English v.0.48 :

  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]