Definition of mid- in English:

mid-

combining form

1Denoting the middle of: midsection
1.1In the middle; medium; half: midway

Origin

Old English midd, of Germanic origin; from an Indo-European root shared by Latin medius and Greek mesos.

Definition of mid- in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal