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heliolatry
heliolithic
heliometer
heliopause
heliophyte
Heliopolis
Helios
helioseismology
heliosphere
heliostat
heliotaxis
heliotherapy
heliotrope
heliotropism
heliozoan
helipad
heliport
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heliosphere
he·li·o·sphere [ hlee ə sfr ]


noun 
Definition:
 
spherical area around Sun: a spherical region around the Sun, approximately 100 astronomical units in radius, outside which interstellar space begins

he·li·o·spher·ic [ hlee ō sférrik ] adjective
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