heliometerPronunciation: /ˌhiːlɪˈɒmɪtə/Definition of heliometer noun Astronomy a refracting telescope with a split objective lens, used for finding the angular distance between two stars. Origin: mid 18th century: from helio- 'of the sun' + -meter (because it was originally used for measuring the diameter of the sun)heliometer in other Oxford dictionaries Definition of heliometer in the US English dictionary
