Astronomy. situated or occurring between the stars: interstellar dust.

1620–30; inter- + stellar Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
interstellar (ˌɪntəˈstɛlə)
conducted, or existing between two or more stars

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1626, "situated between the stars," from inter- + stellar.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The depressing answer in every study so far is that interstellar travel is
  centuries away.
He looks at the energy budget of interstellar missions.
There's this immense gap, as deep and dark as the interstellar night through
  which the cold wind blows.
Galaxies grow as interstellar gases drawn in by gravity cool and condense to
  form new stars.
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