| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| infrared |
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| SYLLABICATION: | in·fra·red |
| PRONUNCIATION: |   n fr -r d |
| ADJECTIVE: | abbr. IR 1. Of or relating to the range of invisible radiation wavelengths from about 750 nanometers, just longer than red in the visible spectrum, to 1 millimeter, on the border of the microwave region. 2. Generating, using, or sensitive to infrared radiation. | | NOUN: | Infrared light or the infrared part of the spectrum.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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