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3 definitions found
 for Protozoa
From The Collaborative International Dictionary of English v.0.48 :

  Protozoon \Pro`to*zo"["o]n\ (-[o^]n), n.; pl. Protozoa. [NL.]
     (Zool.)
        (a) One of the Protozoa.
        (b) A single zooid of a compound protozoan.
            [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Protozoa \Pro`to*zo"a\, n. pl. [NL., fr. Gr. ? first + zo^,on an
     animal.] (Zool.)
     The lowest of the grand divisions of the animal kingdom.
     [1913 Webster]
  
     Note: The entire animal consists of a single cell which is
           variously modified; but in many species a number of
           these simple zooids are united together so as to form a
           compound body or organism, as in the Foraminifera and
           Vorticell[ae]. The reproduction takes place by fission,
           or by the breaking up of the contents of the body after
           encystment, each portion becoming a distinct animal, or
           in other ways, but never by true eggs. The principal
           divisions are Rhizopoda, Gregarin[ae], and Infusoria.
           See also Foraminifera, Heliozoa, Protoplasta,
           Radiolaria, Flagellata, Ciliata.
           [1913 Webster]

From WordNet (r) 3.0 (2006) :

  Protozoa
      n 1: in some classifications considered a superphylum or a
           subkingdom; comprises flagellates; ciliates; sporozoans;
           amoebas; foraminifers [syn: Protozoa, phylum Protozoa]

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