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ultrared

[ uhl-truh-red ]

noun

  1. (not in technical use) infrared.

ultrared

/ ˌʌltrəˈrɛd /

adjective

  1. an obsolete word for infrared
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of ultrared1

First recorded in 1865–70; ultra- + red 1

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