WordReference Random House Learner's Dictionary of American English © 2014
demi-, prefix. 
demi- comes from French, where it has the meaning "half.'' This meaning is found in such words as: demigod, demitasse.


Collins Concise English Dictionary © HarperCollins Publishers::

demi- prefix
  1. half: demirelief
  2. of less than full size, status, or rank: demigod
Etymology: via French from Medieval Latin dīmedius, from Latin dīmīdius half, from dis- apart + medius middle



'demi-' also found in these entries:
In the English description:

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