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The Collaborative International Dictionary

Hemi- \Hem"i-\ [Gr. "hmi-. See Semi-.] A prefix signifying half.

Douglas Harper's Etymology Dictionary

word-forming element meaning "half," from Greek hemi- "half," from PIE root *semi-, which is the source of Sanskrit sami, Latin semi- (see semi-), Old High German sami- "half," and Old English sam-, denoting a partial or imperfect condition (see sandblind).


pre. half.

Usage examples of "hemi-".

The glass depolarized and everyone gasped again as the rings grew brighter, bracketing the deep blue glow that outlined the northern hemi- sphere.