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protist
protium
proto-
Proto-Algonquian
Proto-Germanic
Proto-Indo-European
Proto-Norse
proto-oncogene
Proto-Romance
Proto-Semitic
protoceratops
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protocol statement
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proton pump
pro·ton pump


noun 
Definition:
 
stomach enzyme: the enzyme by which hydrochloric acid is synthesized in the parietal cells of the stomach lining
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