[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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Example sentences
Each pyrheliometer compared consists of a sensing unit and a control unit.
The effect of cleaning the pyrheliometer window is evident from the change in direct normal irradiance prior to local solar noon.
Solar radiation incident on the sea surface is usually measured with a pyrheliometer.
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