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hemisphere

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hem⋅i⋅sphere

  [hem-i-sfeer]
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–noun
1. (often initial capital letter) half of the terrestrial globe or celestial sphere, esp. one of the halves into which the earth is divided. Compare Eastern Hemisphere, Western Hemisphere, Northern Hemisphere, Southern Hemisphere.
2. a map or projection representing one of these halves.
3. a half of a sphere.
4. Anatomy. either of the lateral halves of the cerebrum or cerebellum.
5. the area within which something occurs or dominates; sphere; realm.
Origin:
1325–75; < L hēmisphaerium < Gk hēmisphaírion; r. ME emysperie < OF emispere < L
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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hem·i·sphere   (hěm'ĭ-sfîr')   
n.  

    1. A half of a sphere bounded by a great circle.

    2. A half of a symmetrical, approximately spherical object as divided by a plane of symmetry.

  2. Either half of the celestial sphere as divided by the ecliptic, the celestial equator, or the horizon.

  3. Either the northern or southern half of the earth as divided by the equator or the eastern or western half as divided by a meridian.

  4. Anatomy Either of the lateral halves of the cerebrum; a cerebral hemisphere.

hem'i·spher'ic (-sfîr'ĭk, -sfěr'-), hem'i·spher'i·cal adj., hem'i·spher'i·cal·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

hemisphere

Any half of the Earth's surface.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

hemisphere 
c.1374, from L. hemisphærium, from Gk. hemisphairion, from hemi- "half" + sphaira "sphere."
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: hemi·sphere
Pronunciation: -"sfi(&)r
Function: noun
: half of a spherical structure or organ: as a : CEREBRAL HEMISPHERE b : either of the two lobes of the cerebellum of which one projects laterally andposteriorly from each side of the vermis
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

hemisphere hem·i·sphere (hěm'ĭ-sfēr')
n.

  1. A half of a symmetrical spherical structure as divided by a plane of symmetry.

  2. Either of the lateral halves of the cerebrum; a cerebral hemisphere.

hem'i·spher'ic (-sfēr'ĭk, -sfěr'-) or hem'i·spher'i·cal adj.

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