heliometer Syllabification: (he·li·om·e·ter)Pronunciation: /ˌhēlēˈämitər/Definition of heliometer noun Astronomy, historical 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 British & World English dictionary
