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demi-(word root) half
Examples of words with the root demi-: demigod
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
1. Half: demirelief.
2. To some degree; part; partly: demigod.
[Middle English demi, a half of a measure or unit, from Old French, from Medieval Latin dīmedius, from Latin dīmidius, divided in half : dis-, dis- + medius, half; see medium.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
2. of less than full size, status, or rank: demigod.
[via French from Medieval Latin dīmedius, from Latin dīmīdius half, from dis- apart + medius middle]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a combining form appearing in loanwords from French meaning “half” (demilune), “lesser” (demitasse), or sometimes used with a pejorative sense (demimonde); on this model, also prefixed to words of English origin (demigod).
[< French, comb. form representing demi < Vulgar Latin *dīmedius, for Latin dīmidius half =dī- di-2 + medius middle]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.