Etymology
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interstellar (adj.)

1620s, "situated between or among the stars," in reference to the night sky (modern astronomical sense is from 1670s), from inter- "between" + Latin stella "star" (from PIE root *ster- (2) "star"). Intersiderial in the same sense is from 1650s.

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Definitions of interstellar

interstellar (adj.)
between or among stars;
the density of hydrogen in interplanetary and interstellar space
From wordnet.princeton.edu