| 释义 |
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 |