Definition of rhizocephalan in US English:

rhizocephalan

noun

Zoology
  • A parasitic crustacean of the order Rhizocephala.

adjective

Zoology
  • Of or relating to the order Rhizocephala.

Origin

Late 19th century; earliest use found in Annals and Magazine of Natural History. From Rhizocephala + -an.