pleon

noun

ple·​on

ˈplēˌän

plural -s

1

: the abdomen of a crustacean

2

: the telson of a horseshoe crab

pleonal

-ēənᵊl

adjective

or pleonic

(ˈ)plē¦änik

Word History

Etymology

New Latin, from Greek pleōn, present participle of plein to sail; from the fact that it bears the swimming limbs

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