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heliometer

[hee-lee-om-i-ter]
noun
  1. a telescope with a divided, adjustable objective, formerly used to measure small angular distances, as those between celestial bodies.
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Origin of heliometer

First recorded in 1745–55; helio- + -meter
Related formshe·li·o·met·ric [hee-lee-uh-me-trik] /ˌhi li əˈmɛ trɪk/, he·li·o·met·ri·cal, adjectivehe·li·o·met·ri·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for heliometer

heliometer

noun
  1. a refracting telescope having a split objective lens that is used to determine very small angular distances between celestial bodies
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Derived Formsheliometric (ˌhiːlɪəʊˈmɛtrɪk) or heliometrical, adjectiveheliometrically, adverbheliometry, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012