Definition of cephalon in English:

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Pronunciation: /ˈsefəˌlän/ Pronunciation: /-lən/


(In some arthropods, especially trilobites) the region of the head, composed of fused segments.
Example sentences
  • This problem is reflected in the ongoing uncertainty about the number of biramous appendages in the trilobite cephalon.
  • This specimen cannot be specifically identified because it lacks the cephalon and first thoracic segment.
  • Members of the Agnostina have only two segments between the cephalon and pygidium, and never have cephalic sutures.


Late 19th century: from Greek kephalē 'head'.

For editors and proofreaders

Syllabification: ceph·a·lon

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