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extra-red
extra-red adj.
Brit. 
/ˌɛkstrəˈrɛd/
, /ˌɛkstrəˈrɛd/U.S. /ˌɛkstrəˈrɛd/
said of rays outside the visible spectrum at its red extremity; also ultra-red./ˌɛkstrəˈrɛd/ΘΚΠ
the world > matter > physics > electromagnetic radiation > light > chromatism > [adjective] > infra-red
extra-red1860
infra-red1881
1860 J. Tyndall Glaciers of Alps ii. vi. 254 Water then absorbs all the extra red rays of the sun.
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