A crown or diadem; in zoology, a band-like marking on an animal's head.
From Greek diadema, the Latin form of diadem. In both classical and zoological contexts, describes a crown-like or band-like adornment or marking.
Sea urchins have a structure called a 'diadema'—a radiating pattern of spines that looks like a crown on the ocean floor, showing how nature loves crowning its creatures!
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