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hemi-

1.
a combining form meaning “half,” used in the formation of compound words:
hemimorphic.
Origin
< Greek hēmi- half; cognate with Latin sēmi- semi-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hemi-

hemi-

prefix
1.
half: hemicycle, hemisphere Compare demi- (sense 1), semi- (sense 1)
Word Origin
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
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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
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hemi- in Medicine

hemi- pref.
Half: hemicardia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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hemi- in Science
hemi-  
A prefix meaning "half," as in hemisphere, half a sphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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