Webster's English Dictionary

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protozoan

pro.to.zo.an \.pro-t-*-'zo--*n\ \-'zo--ik\ n [NL Protozoa, phylum name, fr. 
   prot- + -zoa] : any of a phylum or subkingdom (Protozoa) of minute 
   protoplasmic acellula r or unicellular animals with varied morphology and 
   physiology and often complex life cycles that are represented in most 
   habitats including the parasitic - protozoan aj