noun \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


French héliomètre, from hélio- 1heli- + -mètre -meter
First Known Use: 1753


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