phyllidium noun2 •A muscular, leaf-shaped or cuplike outgrowth from the lateral wall of the scolex of some cestodes.The five species described above form an interesting series illustrating the gradual modification of the entire phyllidium into a sucker, just as individual loculi become modified into suckers. — 1927 •A rudimentary form of ctenidium found in some gastropods. formsphyllidia
