Definitions
from The Century Dictionary.
- A group of small parasitic crustaceans, having a cylindroid, sac-like, or disciform unsegmented body, without organs of sense, intestine, limbs, or cement-organs, but with an oral and an anal opening, and the sexual organs well developed.
from the GNU version of the Collaborative International Dictionary of English.
- noun plural (Zoöl.) A division of Pectostraca including saclike parasites of Crustacea. They adhere by rootlike extensions of the head. See
Illusration in Appendix.
Etymologies
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Examples
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In crustaceans such as the rhizocephala, which must formerly have shown a more differentiated structure, fixity and parasitism accompany the degeneration and almost complete disappearance of the nervous system.
Evolution créatrice. English Henri Bergson 1900
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