Zool. [f. Gr. κύαθο-ς CYATHUS + ZOOID.] An abortive first stage of the embryo of certain compound ascidians, which becomes by gemmation the foundation of a colony.
1877. Huxley, Anat. Inv. Anim., x. 616–7. The result [of yelk division] is the formation of an elongated flattened blastoderm which occupies one pole of the egg, and is converted into what I termed the cyathozooid, which is shown by Kowalewsky to be a sort of rudimentary ascidian.
1888. Rolleston & Jackson, Anim. Life, 446. The germinal disc in Pyrosoma developes in the posterior region into a transitory Cyathozooid.
