mi-
combining form 
or mio- also meio-
Etymology: probably from New Latin meio-, from Greek, from meiōn — more at minor 
1.
a. : less 
< Miocene >
: smaller
< Miohippus >
b. : slightly 
< miconcave >
2. : fewer 
< meiophylly >
or mio- also meio-
1.
a.
< Miocene >
: smaller
< Miohippus >
b.
< miconcave >
2.
< meiophylly >