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extra-violet
extra-violet adj.
Brit. 
/ˌɛkstrəˈvʌɪəlᵻt/
, /ˌɛkstrəˈvʌɪəlᵻt/U.S. /ˌɛkstrəˈvaɪələt/
Optics said of rays outside the visible spectrum at its violet extremity./ˌɛkstrəˈvaɪələt/ΚΠ
1863 J. Tyndall Heat (1870) xii. 409 The pile was caused to pass successively through positions corresponding to the various colours of the spectrum, and to its extra-violet rays.
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