Definitions

1. noun

A type of extinct cephalopod closely related to ammonites, found in the Mesozoic era.

“The ammonitoids found in the fossil record provide valuable insights into the evolution of these ancient creatures.”

2. adjective

Resembling or related to ammonites or ammonitoids.

“The ammonitoid fossils discovered in the recent excavation have shed new light on the geological history of the area.”