Wiktionary:Word of the day/2021/August 31

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ultramarine n

In full ultramarine blue: a brilliant blue pigment that was traditionally made from ground-up lapis lazuli, and now usually either extracted from mineral deposits or made synthetically. A brilliant dark blue or slightly purplish colour like that of the pigment. ultramarine adj (archaic) Beyond the sea. Of a brilliant dark blue or slightly purplish colour like that of the pigment (noun sense 1). ultramarine:

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