pleon

Borrowed from New Latin, from Ancient Greek πλέων (pléōn), present participle of πλεῖν (pleîn, “to sail”); from the fact that it bears the swimming limbs.^[1] Alternatively, perhaps in the sense of being longer or extended.

• IPA^(key): /ˈpliːɒn/
• Rhymes: -iɒn

pleon (plural pleons)

1. (zoology) the abdomen of a crustacean

• pleonal
• pleopod

• lopen, Lopen, N-pole

Presumably from Proto-West Germanic *plehan, but ultimate origin unknown. The OED comments "perhaps ult. borrowed from a non-Germanic (substrate) language, although this would be unusual for a strong verb."

• IPA^(key): /ple͜oːn/

plēon

1. (with genitive) to endanger, risk