Definitions

1. noun

A type of sea cucumber (Holothuroidea) with a long, soft body and a network of tiny tube feet.

“The marine biologist studied the behavior of various acridians in their natural habitat.”

2. noun

A type of fossilized sea cucumber (Holothuroidea) with a long, soft body and a network of tiny tube feet.

“The paleontologist examined the fossilized acridians in the museum’s collection.”