Word Study
rhizocephala
CIDE DICTIONARY
rhizocephala, n. pl. [NL., fr. Gr. root + head.].
A division of Pectostraca including saclike parasites of Crustacea. They adhere by rootlike extensions of the head. See Illusration in Appendix. [1913 Webster]
For further exploring for "rhizocephala" in Webster Dictionary Online