protozoon

noun
pro·to·zo·on | \ˌprō-tə-ˈzō-ˌän \
plural protozoa\ˌprō-tə-ˈzō-ə \

Definition of protozoon 

First Known Use of protozoon

circa 1853, in the meaning defined above

History and Etymology for protozoon

New Latin, from singular of Protozoa

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The first known use of protozoon was circa 1853

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protozoon

noun
pro·to·zo·on | \ˌprōt-ə-ˈzō-ˌän \
plural protozoa

Medical Definition of protozoon 

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