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protolanguage
protolithic
protomartyr
protomorphic
proton
proton number
proton pump
proton pump inhibitor
proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
protoplast
protoporphyrin
protostar
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protozoon
pro·to·zo·on


noun 
Definition:
 
microbiology 
Another spelling of  protozoan
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