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English definition of “prot(o)-”

prot(o)-

prefix     /prəʊ.təʊ-/ US  /proʊ.t̬oʊ-/
first, especially from which other similar things develop ; original : protoplasm a prototype First and firstly
(Definition of prot(o)- prefix from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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