proto

(s) indicating the first or earliest or original
- "proto" is a combining form in a word like "protolanguage" that refers to the hypothetical ancestor of another language or group of languages

prod prof prom prop prow prox

probe prole prone prong pronk proof props prose prosy proud prove Provo prowl proxy

protoactinium protoanthropology protoarchaeology protoarcheology protoavis protoceratops protocol protoctist Protoctista protoctist family protoctist genus protoctist order protogeometric protoheme protohemin protohippus protohistory Proto-Indo European protology protomammal proton proton accelerator proton magnetic resonance Proto-Norse proto-oncogene protoplasm protoplasmic astrocyte protoplast Prototheria prototherian prototypal prototype prototypic prototypical Protozoa protozoal protozoal infection protozoan protozoic protozoological protozoologist protozoology protozoon