Etymology
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Words related to ultraviolet

ultra- 

word-forming element meaning "beyond" (ultraviolet) or "extremely" (ultramodern), from Latin ultra- from ultra (adv. and prep.) "beyond, on the other side, on the farther side, past, over, across," from PIE *ol-tero-, suffixed form of root *al- "beyond." In common use from early 19c., it appears to have arisen from French political designations. As its own word, a noun meaning "extremist" of various stripes, it is first recorded 1817, from French ultra, shortening of ultra-royaliste "extreme royalist."

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violet (n.)

small wild plant with purplish-blue flowers, c. 1300, from Old French violete (12c.), diminutive of viole "violet," from Latin viola "the violet, a violet color," cognate with Greek ion (see iodine), probably from a pre-Indo-European substrate Mediterranean language. The color sense (late 14c.) developed from the flower.

infra-red (adj.)

also infrared, 1873, "below the red" (in the spectrum), from infra- + red (adj.1). As a noun, also from 1873.

UV 

abbreviation of ultraviolet, by 1928.