Definition of: rotifer

(rō′tə·fər) noun
One of a division (Rotifera) of many–celled, microscopic, aquatic organisms usually found in stagnant fresh water, having rings of cilia which in motion resemble revolving wheels; a wheel animalcule. Some authorities place the Rotifera in a separate class or phylum, Rotatoria. [<NL <L rota wheel + ferre bear]
—ro·tif·er·al (rō·tif′ər·əl), ro·tif′er·ous adjective