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• hemi
  hemi

  noun

  an internal-combustion engine having hemispherical combustion chambers.
• hemi-
  hemi-

  a combining form meaning “half,” used in the formation of compound words.
• hemi–
  hemi–

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

hemi

¹ American  

[hem-ee] / ˈhɛm i /

noun

Automotive.

1. an internal-combustion engine having hemispherical combustion chambers.

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hemi- ² American  

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

   hemimorphic.

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hemi- British  

prefix

1. half Compare demi- semi-

   hemicycle

   hemisphere

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hemi– Scientific  

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

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Usage

What does hemi- mean? Hemi- is a combining form used like a prefix meaning “half.” It is often used in medical terms, especially in pathology and anatomy. Hemi- comes from Greek hēmi-, meaning “half.” The Latin cognate of hēmi- is sēmi-, also meaning “half,” which is the source of English terms such as semicircle and semimonthly. To learn more, check out our entries for both words.

Etymology

Origin of hemi¹

Shortening of hemi-head

Origin of hemi-²

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

Example Sentences

See Examples For:

hemi hemi-

The guy who won the unlimited fuel class drove a massive machine powered by four blown hemi V-8’s making in excess of 3,000 horsepower.

From Salon ● Feb. 6, 2019

A 1956 New Yorker with a hemi engine in it.

From Seattle Times ● Oct. 25, 2018

An abandoned hemi was nothing compared to that.

From Slate ● May 29, 2018

The southern right whale population, which lives in the southern hemi sphere, has been growing by 7–8 percent every year, but figures for North Atlantic right whales are gloomy.

From Scientific American ● Aug. 9, 2013

Yes, John, the word "hemiptera" comes from two Greek words, hemi, meaning half, and, as you know, pteron, meaning a wing.

From The Insect Folk by Margaret Warner Morley

Who will say that infancy can utter 74:24 the ideas of manhood, that darkness can represent light,         that we are in Europe when we are in the opposite hemi-         sphere?

From Science and Health, with Key to the Scriptures by Mary Baker Eddy