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Longman Dictionary of Contemporary English
demi-
prefix
EXAMPLES FROM OTHER ENTRIES
▪ a demigod
▪ a demitasse
The Collaborative International Dictionary
Demi-

Demi- \Dem"i-\ [F. demi-, fr. L. dimidius half; di- = dis- + medius middle. See Medium, and cf. Demy, Dimidiate.] A prefix, signifying half.

Douglas Harper's Etymology Dictionary
demi-

word-forming element meaning "half, half-sized, partial," early 15c., from Old French demi "half" (12c.), from Late Latin dimedius, from Latin dimidius "half, one-half," which contains the elements dis- "apart" (see dis-) + medius "middle" (see medial).

Wiktionary
demi-

pre. half

Wikipedia
Demi-
  1. redirect Demi

Category:Metric prefixes