Plural of cyathium; cup-shaped flower clusters found in plants like poinsettias and euphorbias.
From Latin cyathium (diminutive of cyathus), combining the Greek cup-shape concept with the Latin diminutive suffix -ium, used in botany to describe specialized flower structures.
Poinsettias look like they have big showy petals, but what you're really seeing is a fake flower made of specialized leaves—the actual tiny flowers are hidden in cup-shaped structures called cyathia that are perfectly designed to trap insects!
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