First Known Use: 1753
Dictionary
heliometer
noun he·li·om·e·ter \ˌhē-lē-ˈä-mə-tər\
Definition of HELIOMETER
: 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
— he·lio·met·ric \ˌhē-lē-ō-ˈme-trik\ adjective
— he·lio·met·ri·cal·ly \-tri-k(ə-)lē\ adverb
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Origin of HELIOMETER
French héliomètre, from hélio- 1heli- + -mètre -meter
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