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

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

pygidial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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]

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