pəˈrī]ˌän, -rā], -rē] noun
or pe·re·on -rē]ˌän ; also pe·rae·on -rē]
( plural pe·reia ]ə)
Etymology: New Latin, from Greek peraiōn, present participle of peraioun to transport, carry over, from peraios situated beyond, from pera beyond; from the walking appendages; akin to Sanskrit para further, ulterior, Greek peran to pass through — more at fare
: the thorax or the 7 metameres constituting the thorax of some crustaceans (as a decapod or a copepod)