par·a·po·di·um 
(păr′ə-pōdē-əm)
(păr′ə-pōdē-əm)n. pl. par·a·po·di·a (-dē-ə)
1. One of the fleshy paired appendages of polychaete annelids that function in locomotion and breathing.
2. A winglike extension of the foot of certain gastropods, such as the sea butterflies, used for swimming.
[New Latin : PARA- + Greek pous, pod-, foot; see PODIUM.]