heliomicrometer

noun
he·​lio·​micrometer | \ ¦hēlē(ˌ)ō+ \

Definition of heliomicrometer

: an instrument for determining heliographic positions of spots and flocculi shown on direct photographs of the sun or on spectroheliograph plates

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History and Etymology for heliomicrometer

heli- entry 1 + micrometer

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Cite this Entry

“Heliomicrometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heliomicrometer. Accessed 25 Oct. 2020.

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