The Collaborative International Dictionary of English v.0.48:

Flagellata \Flag`el*la"ta\, n. pl. [NL., fr.L. flagellatus, p.
   p. See Flagellate, v. t.] (Zool.)
   An order of Infusoria, having one or two long, whiplike
   cilia, at the anterior end. It includes monads. See
   Infusoria, and Monad.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Flagellata
    n 1: protozoa having flagella [syn: Mastigophora, class
         Mastigophora, Flagellata, class Flagellata]