Definition of rhombiferan in US English:

rhombiferan

adjective

  • Of or relating to the class Rhombifera, which comprises cystoid echinoderms having diamond-shaped arrangements of pores on the thecal plates.

noun

  • A rhombiferan echinoderm.

Origin

1920s. From scientific Latin Rhombifera, earlier † Rhombiferi, class name (in K. A. von Zittel Handbuch der Palaeontologie I. 417, attributed to J. Müller; from scientific Latin rhombifer: see rhombifer) + -an.