pereion
/pəˈrʌɪən/ /pəˈriːən/(also peraeon, pereon) Zoology
noun
The part of a crustacean between the head and the abdomen, bearing the pereiopods; the crustacean thorax, especially those thoracic segments that are not fused with the head.
Origin
Mid 19th century. From scientific Latin pereion from ancient Greek περαιῶν, contracted form of περαιόων, present participle of περαιοῦν to carry across (erroneously taken as ‘to walk about’) from πέρᾱ beyond.