2. <chemistry> Denoting a type of hydrocarbons which are regarded as methenyl derivatives. Also used adjectively.
3. 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.
4. Attached to a carbon atom located between two hereoatoms in a heterocyclic ring.
Origin: Gr. mesos in the middle.
(05 Feb 2009)
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