The most blue in color or intensity; the deepest, richest, or darkest shade of blue among things being compared.
Superlative form of 'blue' (blue + -est), following standard English adjective intensification, where 'blue' originates from Old English 'blaw' and Proto-Germanic roots.
Interestingly, across languages, 'blue' is actually one of the latest color words to develop—ancient Greek had no single word for blue, and some languages still don't distinguish it as clearly as blue-speakers do, suggesting language shapes how we see colors.
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