helio-meter

heliometer

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

Origin:
1745–55; helio- + -meter

heliometric [hee-lee-uh-me-trik] , heliometrical, adjective
heliometrically, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heliometer (ˌhiːlɪˈɒmɪtə)
 
n
a refracting telescope having a split objective lens that is used to determine very small angular distances between celestial bodies
 
heliometric
 
adj
 
helio'metrical
 
adj
 
helio'metrically
 
adv
 
heli'ometry
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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