What is a latin morpheme for “middle” which can be used as a prefix, instead of “sub“ and “super”?
The context is the use of such a construct in English. So the following mentions some English examples.
One can say “subscript“ and “superscript”, and normal text is probably just “script”. But it might sometimes be useful to use a prefix which means “normal“ or “middle”, to make the distinction clear. You can also say “subordinate” and “superordinate” (though “superior” is probably more common), but there is apparently no similar word for “colleague” or “peer”. (By the way: one can not use the word “ordinate” itself for that, according to Merriam-Webster.)