midi-

midi-

combining form
of medium or middle size, length, etc: midibus.
[C20: from mid-; on the model of maxi and mini]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014