Definition of pygidium in English:

pygidium

Syllabification: py·gid·i·um
Pronunciation: /pīˈjidēəm
 
/

noun (plural pygidia /-ˈjidēə/)

Zoology
  • The terminal part or hind segment of the body in certain invertebrates.
    More 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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