A deep blue or blue-green color, or a pigment or dye of this shade.
From Latin 'caeruleus' meaning 'blue' or 'dark blue,' possibly derived from 'caelum' (sky). The term has been used since medieval times to describe blue pigments and dyes.
The same Latin root 'caeruleus' also gave us the word 'cerulean,' and ancient Romans were obsessed with this color because true blue dyes were incredibly rare and expensive—more valuable than gold!
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