| a combining form meaning “middle,” used in the formation of compound words: mesocephalic. |
| meso- or mes- pref.
[Greek, from mesos, middle; see medhyo- in Indo-European roots.] |
meso- or mes-
pref.
In the middle; middle: mesoderm.
Intermediate: mesomere.
Mesentery: mesoileum.
Characterizing a superimposable isomer: meso-2,3-dichlorobutane.