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protoporphyrin
protostar
protostome
prototherian
prototrophic
prototype
protoxide
protozoan
protozoology
protozoon
protract
protracted
protractile
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protozoology
pro·to·zo·ol·o·gy [ prtə zō ólləjee ]


noun 
Definition:
 
study of protozoans: the branch of zoology that studies protozoans
[Early 20th century. <protozoan]

pro·to·zo·o·log·i·cal [ prtə z ə lójjik'l ] adjective
pro·to·zo·ol·o·gist [ prtə zō ólləjist ] noun
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