heliometer Hear it!

heliometer definition

he·li·om·eter (hē′lē äm′ət ər)

noun

an instrument formerly used for measuring the angular distance between two stars

Etymology: Fr héliomètre: see helio- & -meter: so called because orig. used in measuring the sun's diameter

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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