American English

Definition of protozoan noun from the Oxford Advanced American Dictionary

 

protozoan

 noun
noun
NAmE//ˌproʊt̮əˈzoʊən//
 
(pl. protozoans or protozoa
NAmE//ˌproʊt̮əˈzoʊə//
 
)
(biology)
 
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a very small living thing, usually with only one cell, which can only be seen under a microscope
protozoan adjective
 
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