proto-, prot- (Greek: first, original; used as a prefix).Protoabia: 
Protoavis: 
protobiont: 
protobios: 
protocol: 
protoderm: 
protoepiphyte: 
protogynous: 
protogyny: 
protolithic: 
protomartyr: 
proton: 
protopathic: 
protophyte: 
protoplasm: 
protoplasmic: 
protoptile: 
prototrophic: 
prototype: 
protoxylem: 
protozoa: 
protozoacide: 
protozoan: 
protozoiasis: 
protozoic: 
protozoology: 
protozoon: 
protozoophage: 
protozootherapy: 
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