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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
heliosphere is a noun meaning "the region inside the heliopause containing the sun and solar system". It carries one recorded sense.
the region inside the heliopause containing the sun and solar system
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for heliosphere come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.