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

Nearby words

  1. hemelytron,
  2. hemeralopia,
  3. hemerocallis,
  4. hemet,
  5. hemi,
  6. hemi-head,
  7. hemiacetal,
  8. hemiageusia,
  9. hemialgia,
  10. hemiamyosthenia

Origin of hemi-

< Greek hēmi- half; cognate with Latin sēmi- semi-

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for hemi-



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

Word Origin for hemi-

from Latin, from Greek hēmi-

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

Word Origin and History for hemi-


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).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for hemi-




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

Science definitions for hemi-


A prefix meaning “half,” as in hemisphere, half a sphere.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.