ˌrēsepˌtakyəˈlīd.(ˌ)ēz noun
Usage: capitalized
Etymology: New Latin, from receptaculum + -ites
: a genus (the type of the family Receptaculitidae) of Ordovician and Devonian calcareous fossils consisting of closely spaced plates or pillars that form a globose or discoidal mass — see sunflower coral