English dictionary
pygidium
/p/aI/'/dZ//I/d/i//@/m/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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The caudal plate of trilobites, crustacean, and certain insects. See <i>Illust.</i> of <u>Limulus</u> and <u>Trilobite</u>.
Source: webster1913