Akademik

mes-
combining form or meso-
Etymology: Latin, from Greek, from mesos — more at mid
1.
a. : in the middle : intermediate (as in position, size, type, time, degree)

mesoderm

mesodont

mesonephroma

mesoplankton

mesoprosopic

Mesozoa

mesocarp

b. : mesentery or membrane supporting a (specified) part

mesocaecum

mesocolon

mesarchium

c. : mesoderm : mesodermal and

mesameboid

2. meso- : a reduction product of a porphyrin or other pyrrole derivative in which one or more vinyl groups have been hydrogenated to ethyl

mesohemin

mesobilirubin

3. : an inorganic acid regarded as an intermediate hydrated form

dimesoperiodic acid H4I2O9

4. meso-, usually italic
a. : an optical isomer whose inactivity is attributed to the molecule's being internally compensated

meso-tartaric acid

b. : a middle position or group especially in a cyclic compound

meso-chloro-anthracene is 9-chloro-anthracene

meso-phenyl-imidazole is 2-phenyl-imidazole

— abbr. ms or μ
5. : of late Paleozoic or of Mesozoic age — in names of igneous rocks

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var. of meso- before vowels: mesencephalon.

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mes-,
combining form. the form of meso- (Cf. ↑meso-) before vowels, as in mesencephalon.

Useful english dictionary. 2012.