| 单词 | pygidium | 
| 释义 | Word Frequency pygidium(paɪˈdʒɪdɪəm, -ˈɡɪd-) nounWord forms:  plural -ia (-ɪə) the terminal segment, division, or other structure in certain annelids, arthropods, and other invertebrates  Derived formspygidial (pyˈgidial) adjective Word originC19: from New Latin, from Greek pugē rump | 
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