[pahyuhr-hee-lee-om-i-ter, pir-]
noun Astrophysics.
an instrument for measuring the total intensity of the sun's energy radiation.

1860–65; pyr- + helio- + -meter

pyrheliometric [pahyuhr-hee-lee-uh-me-trik, pir-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyrheliometer (pəˌhiːlɪˈɒmɪtə)
an instrument for measuring the intensity of the sun's radiant energy

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pyrheliometer   (pīr'hē-lē-ŏm'ĭ-tər)  Pronunciation Key 
An instrument used to measure the total amount of radiation from the Sun that hits a surface. It works by converting the Sun's heat into a voltage that is then recorded by a voltmeter.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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