pygidia

pygidium

[pahy-jid-ee-uhm]
noun, plural pygidia [pahy-jid-ee-uh] . Zoology.
any of various structures or regions at the caudal end of the body in certain invertebrates.

Origin:
1840–50; < Neo-Latin < Greek pȳg() rump + -idion diminutive suffix

pygidial, adjective
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World English Dictionary
pygidium (paɪˈdʒɪdɪəm, -ˈɡɪd-)
 
n , pl -ia
the terminal segment, division, or other structure in certain annelids, arthropods, and other invertebrates
 
[C19: from New Latin, from Greek pugē rump]
 
py'gidial
 
adj

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