Why this word is great
CERULEAN — [Adjective] Of a deep, serene blue reminiscent of a clear sky at a liminal hour. From Latin caeruleus ("blue, dark blue, azure"), from caelum ("sky, heaven") + the suffix -uleus, with the English suffix -an. Unlike "azure," which evokes a bright, unclouded brilliance, or "cobalt," which names a bold, mineral intensity, cerulean is the sky's own quieter, more contemplative self. It is the specific blue of a late summer afternoon just before the light begins to gold, the cool, profound tint of a deep alpine lake, and the fading wash on a porcelain plate—the color of distance itself, forever tinged with the melancholy of earthbound perception.