noun he·li·om·e·ter \ˌhē-lē-ˈä-mə-tər\

Definition of heliometer

  1. :  a visual telescope that has a divided objective designed for measuring the apparent diameter of the sun but also used for measuring angles between celestial bodies or between points on the moon


play \ˌhē-lē-ō-ˈme-trik\ adjective


play \ˌhē-lē-ō-ˈme-tri-k(ə-)lē\ adverb

Origin and Etymology of heliometer

French héliomètre, from hélio- 1heli- + -mètre -meter

First Known Use: 1753

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