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pleon

[plee-on]
noun
  1. the abdomen of a crustacean.
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Origin of pleon

1850–55; noun use of Greek pléōn, present participle of pleîn to swim, sail; see pleopod
Related formsple·on·al [plee-uh-nl] /ˈpli ə nl/, ple·on·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of pleon