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pyracantha
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Pyramus and Thisbe
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pyrheliometer

pyr·he·li·om·e·ter [ pr heelee ómmətər ] (plural pyr·he·li·om·e·ters)


noun 
Definition:
 
instrument measuring strength of Sun's radiation: an instrument that measures the intensity of the Sun's radiation received at the Earth's surface

[Mid-19th century. < Greek pur "fire" + helios "sun"]

pyr·he·li·o·met·ric [ pr heelee ə méttrik ] adjective
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