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interstellar

adjective [before noun]
 
 
/ˌɪn.təˈstel.ər/ US  /-t̬ɚˈstel.ɚ/

Definition

between the stars: interstellar spaceAstronomy - general words
(Definition of interstellar adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of interstellar