proto- — first, earliest, original (affix)

proto- first, earliest, original
Component prefix

Greek · The first or primitive form (prototype, protozoa).

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Used in (3)

protocol C1
/ˈpɹoʊtəˌkɑl/ A set of rules for how something should be done correctly.
protagonist C1
/pɹoʊˈtæɡ.ə.nɪst/ The main character in a story, film, or play.
prototype C2+
/ˈproʊtəˌtaɪp/ an original model on which later versions are based; to make one

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