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[puh-rahy-on, -rey-, -ree-]
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noun, plural pe·rei·a [puh-rahy-uh, -rey-uh, -ree-uh] /pəˈraɪ ə, -ˈreɪ ə, -ˈri ə/.
  1. (in a crustacean) the thorax.
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Origin of pereion

1850–55; < New Latin, representing Greek peraiôn (present participle of peraioûn to carry about, transport); so called from the location of the legs on the thorax
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018