|Also called: wheel animalcule any minute aquatic multicellular invertebrate of the phylum Rotifera, having a ciliated wheel-like organ used in feeding and locomotion: common constituents of freshwater plankton|
|[C18: from New Latin Rotifera, from Latin rota wheel + ferre to bear]|
|rotifer (rō'tə-fər) Pronunciation Key
Any of various tiny, multicellular aquatic animals of the phylum Rotifera, having a wheel-like ring of cilia at their front ends. The cilia trap small organisms for food. Rotifers are grouped by some scientists together with nematodes and some other invertebrates as aschelminths.