protozoon

from WordNet (r) 3.0 (2006)

protozoon
    n 1: any of diverse minute acellular or unicellular organisms
         usually nonphotosynthetic [syn: {protozoan}, {protozoon}]

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]

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