Definitions

1. noun

A genus of extinct sea urchins, known from fossil records.

“Fossil discoveries reveal a new species of osteoncus, providing insights into ancient marine ecosystems.”

2. adjective

Relating to or resembling osteoncus, especially in having a spiny or urchin-like appearance.

“The unique morphology of the fossilized creature was described as osteoncous, highlighting its distinct characteristics.”