protozoan
noun/ˌprəʊtəˈzəʊən/
/ˌprəʊtəˈzəʊən/
(plural protozoans, protozoa
(biology)/ˌprəʊtəˈzəʊə/
/ˌprəʊtəˈzəʊə/
)- a very small living thing, usually with only one cell, that can only be seen under a microscope
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protozoan