Definition of "ultrabright" [ultrabright]

• Very bright (adjective)

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• "The only one of its kind in the world, the laser makes ultrabright, ultrafast X-ray pulses from a high-energy electron beam."
• "She tossed that superstar hair of ours, and flashed our ultrabright baby blues."
• "Long before the sun rises, ultrabright Venus climbs the eastern morning sky in the constellation Virgo."