Middle English, from demi, from Anglo-French, from Vulgar Latin *dimedius, modification of Latin dimidius, from dis- + medius mid — more at mid
“Demi-.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/demi-. Accessed 8 Jan. 2026.
demi-
derived from Latin dimidius "half"
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