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An inflorescence consisting of a small cuplike structure enclosing a female flower and several male flowers, characteristic of plants in the genus Euphorbia, such as the poinsettia.

[New Latin, from kuathion, diminutive of kuathos, ladle.]


a form of inflorescence of the type found on the poinsettia
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Its citric lime green heads glow like beacons when it is at its peak and, since they're composed not of petals but of cyathium leaves, last for months.
Comparative ontogeny of the cyathium in Euphorbia and its allies: exploring the organ-flower-inflorescence boundary.