mes-

1.
variant of meso- before vowels:
mesencephalon.
British Dictionary definitions for mes-

mes-

combining form
1.
a variant of meso- mesarch, mesencephalon, mesenteron

meso-

combining form
1.
middle or intermediate: mesomorph
Word Origin
from Greek misos middle
mes- in Medicine

mes- pref.
Variant of meso-.