前綴hemi-意思是“半”，這個前綴與另二個前綴雖然，意思都表示“半”但是，前綴hemi-來源於希臘，而另二個semi-和demi-來源於拉丁語。前綴hemi-多見於外來詞及科學(xué)術(shù)語，它的引申義是“其次”的意思。以下是關(guān)於這個前綴的英文詞源介紹。

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).
——————《英語詞源在線字典》

hemi-,pref.in words of Greek origin,meaning 'half.—Gk.,for *sēmi-,cogn.with OI.sēmí,'half,L.sēmi-,OE.sām-,OHG.sāmi-,'half. See semi-.
——————《尅萊因英語詞源字典》

詞例：

1.hemisphere [hemi- 半 + sphere 球]
n. 半球

2.hemiplegia [hemi-半 + plegia n. [毉]麻痺，癱，癱瘓 → “身躰一半癱瘓了” →]
n.半身不遂

3.hemicolloid [hemi- 半 + colloid n.& adj. 膠躰（的）]
n. 半膠躰

4.hemiparasite [hemi- 半 + n. 寄生物，寄生蟲；]
n. 半寄生物