Mes- (?).
See Meso-.
© Webster 1913.
Mes"o- (?), Mes- (?). [Gr. in the middle.]
A combining form denoting in the middle, intermediate; specif. Chem., denoting a type of hydrocarbons which are regarded as methenyl derivatives. Also used adjectively.
<-- in Chem., now used differently, for optical isomers -->
© Webster 1913.