ˌperəˈkarədə noun plural
Usage: capitalized
Etymology: New Latin, from Greek pēra pouch, bag + New Latin -carida (from Latin carid-, caris, a kind of sea crab) — more at -caris
: a division of Malacostraca including among others the amphipods and isopods all having the first thoracic segment fused with the head, the thoracic legs flexed between the fifth and sixth segments, and the young developed in a brood pouch from which they escape at a late stage