ˈplēˌän noun
( -s )
Etymology: New Latin, from Greek pleōn, present participle of plein to sail; from the fact that it bears the swimming limbs — more at flow
1. : the abdomen of a crustacean
2. : the telson of a king crab
• ple·o·nal -ēən ə l or ple·on·ic (ˈ)plē|änik adjective