'Rotifer' definitions:

Definition of 'rotifer'

(from WordNet)
noun
Minute aquatic multicellular organisms having a ciliated wheel-like organ for feeding and locomotion; constituents of freshwater plankton

Definition of 'Rotifer'

From: GCIDE
  • Rotifer \Ro"ti*fer\ (?; 277), n. [NL. see Rotifera.] (Zool.) One of the Rotifera. See Illust. in Appendix. [1913 Webster]