say it: in-tur-STEL-ur
interstellar is an adjective meaning "between or among stars". It is pronounced /ˌɪntɚˈstɛlɚ/ — in-tur-STEL-ur. It carries one recorded sense.
between or among stars
“the density of hydrogen in interplanetary and interstellar space”
Definitions, synonyms and semantic relations for interstellar come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.