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protoplast
protoporphyrin
protostar
protostome
prototherian
prototrophic
prototype
protoxide
protozoan
protozoology
protozoon
protract
protracted
protractile
protraction
protractor
protrude
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protozoan

pro·to·zo·an [ prtə zṓ ən ] (plural pro·to·zo·ans) or pro·to·zo·on [ prtə zṓ òn ] (plural pro·to·zo·ons or pro·to·zo·a [ prtə zṓ ə ])


noun 
Definition:
 
single-celled organism: a single-celled organism that can move and feeds on organic compounds of nitrogen and carbon, e.g. an amoeba. Kingdom Protoctista.

[Mid-19th century. < modern Latin Protozoa "first animals" < Greek zōia, plural of zōion "animal"]

pro·to·zo·al adjective
pro·to·zo·an adjective
pro·to·zo·ic adjective
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