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The Collaborative International Dictionary of English v.0.48 (gcide)

Mes- \Mes-\ (m[e^]s-).
See {Meso-}.
[1913 Webster]


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]