Definitions

1. adjective

Relating to or forming a series of flat, usually rounded, segments or plates, as in the bodies of certain mollusks.

“The parapodial flaps on the sea slug’s underside helped it to swim faster.”

2. noun

A flat, usually rounded, segment or plate, especially one of a series forming the body of a mollusk.

“The parapodia of the octopus made it look like a strange, alien creature.”