Definition of protozoan noun from the Oxford Advanced Learner's Dictionary

 

protozoan

 noun
noun
BrE BrE//ˌprəʊtəˈzəʊən//
 
; NAmE NAmE//ˌproʊtəˈzoʊən//
 
(pl. protozoans, protozoa
BrE BrE//ˌprəʊtəˈzəʊə//
 
; NAmE NAmE//ˌproʊtəˈzoʊə//
 
)
(biology)
 
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a very small living thing, usually with only one cell, that can only be seen under a microscope

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