Definition of cyathium in English:

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Pronunciation: /sīˈaTHēəm/

noun (plural cyathia /-ˈaTHēə/)

The characteristic inflorescence of the spurges, resembling a single flower. It consists of a cup-shaped involucre of fused bracts enclosing several greatly reduced male flowers and a single female flower.
Example sentences
  • All are tree Euphorbias, have minute sessile leaves and yellowish cyathia but differ in other respects.
  • A commonly encountered cluster of three cyathia with a mixed sexual orientation is called a cyme.
  • That means that there are plants that produce only male cyathia and others that produce only female ones.


Late 19th century: modern Latin, from Greek kuathion, diminutive of kuathos 'cup'.

For editors and proofreaders

Syllabification: cy·ath·i·um

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