01 A combining form denoting in the middle, intermediate.
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1.
A combining form denoting in the middle, intermediate.
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2.
Denoting a type of hydrocarbons which are regarded as methenyl derivatives. Also used adjectively.(Chem.)
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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.(Chem.)
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4.
Attached to a carbon atom located between two hereoatoms in a heterocyclic ring.