Cyathium Definition
 sī-ăthē-əm 
    noun
  
 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.
 American Heritage 
Other Word Forms of Cyathium
Noun
Singular:
 cyathiumPlural:
 cyathiaOrigin of Cyathium
New Latin from kuathion diminutive of kuathos ladle
From American Heritage Dictionary of the English Language, 5th Edition
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