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heliosphere

[hee-lee-uh-sfeer] /ˈhi li əˌsfɪər/
noun, Astronomy
1.
the region around the sun over which the effect of the solar wind extends.
Origin
1970-1975
1970-75; helio- + -sphere
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for helio sphere

heliosphere

/ˈhiːlɪəʊˌsfɪə/
noun
1.
the region around the sun outside of which the sun's influence is negligible and interstellar space begins
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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helio sphere in Science
heliosphere
  (hē'lē-ə-sfîr')   
The large, roughly elliptical region of space around the Sun through which the solar wind extends and through which the Sun exerts a magnetic influence. The heliosphere extends well beyond the orbits of the planets, and its shape and extent fluctuate with changes to the solar wind and other influences. ◇ The boundary between the heliosphere and interstellar space is known as the heliopause.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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