ˌpen.trəˈmīˌtēz noun
Usage: capitalized
Etymology: New Latin, from penta- (from Greek) + Greek trēma hole + New Latin -ites — more at throw
: a genus (the type of the family Pentremitidae) comprising Mississippian blastoid echinoderms having an ovate or pyriform calyx with five ambulacral areas suggestive of petals