Definitions

1. noun

A type of extinct sea creature, related to echinoderms.

“The discovery of an actinocrinid fossil in the ancient sea bed provided valuable insights into the evolution of marine life.”

2. noun

A type of extinct sea creature, a member of the order Actinocrida, a group of extinct crinoids.

“The paleontologist was thrilled to find an almost complete actinocrinid specimen, which would be a significant addition to the museum’s collection.”