1. a combining form meaning “half,” used in the formation of compound words: hemimorphic.


  1. halfhemicycle; hemisphere Compare demi- (def. 1), semi- (def. 1)

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).


  1. Half:hemicardia.

  1. A prefix meaning “half,” as in hemisphere, half a sphere.

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