n. any microscopic animal of the phylum Rotifera, found in fresh and salt waters, having one or more rings of cilia on the anterior end. Also called wheel animalcule.[1785–95; < New Latin Rotifera= Latin rot(a) wheel + -i--i- + -fera, neuter pl. of -fer -fer]ro•tif′er•al (-ˈtɪf ər əl) ro•tif′er•ous, adj. MedicalSeerotifer