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protostar
protostome
prototherian
prototrophic
prototype
protoxide
protozoan
protozoology
protozoon
protract
protracted
protractile
protraction
protractor
protrude
protrusile
protrusion
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protozoon
pro·to·zo·on


noun 
Definition:
 
microbiology 
Another spelling of  protozoan
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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