Definition of pygidium in English:

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pygidium

Pronunciation: /pʌɪˈdʒɪdɪəm/
/pʌɪˈɡɪdɪəm/

noun (plural pygidia /pʌɪˈdʒɪdɪə/ /pʌɪˈɡɪdɪə/)

Zoology
The terminal part or hind segment of the body in certain invertebrates.
Example sentences
  • The pygidium, like the cephalon, was a structure in which segments were fused together.
  • A pygidium with an attached thoracic segment represents a meraspid stage of the species.
  • By contrast, some representatives of the Olenelloidea have pygidia with multiple segments.

Origin

Mid 19th century: modern Latin, from Greek pugē 'rump'.

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