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demi-

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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).
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Origin of demi-

<French, combining form representing demi (adj.; also noun and adv.) <Vulgar Latin *dīmedius, for Latin dīmidius half, equivalent to dī-di-2 + medius middle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use demi- in a sentence

British Dictionary definitions for demi-

demi-

prefix
halfdemirelief Compare hemi-, semi- (def. 1)
of less than full size, status, or rankdemigod

Word Origin for demi-

via French from Medieval Latin dīmedius, from Latin dīmīdius half, from dis- apart + medius middle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for demi-

demi-

pref.
Half:demilune.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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