n.
Pronunciation: ' h ē -l ē - ə - ˌ sfir, - ō -
Function: noun
Etymology: International Scientific Vocabulary
Date: 1976
: the region in space influenced by the sun or solar wind
– he · li · o · spher · ic \ ˌ h ē -l ē - ə - ' sfir-ik, - ' sfer-, -l ē - ō - \ adjective