Relating to electromagnetic radiation with wavelengths shorter than visible light; invisible light rays that can cause sunburns.
From 'ultra-' (beyond) + 'violet' (the color at the edge of visible spectrum). The term was coined in the 1800s as scientists discovered light beyond the violet wavelengths.
Many animals like bees and hummingbirds can see ultraviolet light invisible to humans, so flowers have special UV patterns like landing strips to guide them to nectar!
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