adjective Zoology.
belonging to the Rhizocephala, a group of degenerate hermaphrodite crustaceans that are parasitic chiefly on crabs.

1890–95; rhizo- + -cephalous

rhizocephalan, noun
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World English Dictionary
rhizocephalan (ˌraɪzəʊˈsɛfələn)
1.  any parasitic crustacean of the order Rhizocephala, esp Sacculina carcini, which has a saclike body and sends out absorptive processes into the body of its host, the crab: subclass Cirripedia (barnacles)
2.  of, relating to, or belonging to the order Rhizocephala
[C19: from New Latin Rhizocephala (literally: root-headed), from rhizo- + -cephala from Greek kephalē head]

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