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protogalaxy
protohuman
protoindustrialization
protolanguage
protolithic
protomartyr
protomorphic
proton
proton number
proton pump
proton pump inhibitor
proton synchrotron
protonema
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protoplasm
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protoxide
pro·tox·ide [ prō tók sd ]


noun 
Definition:
 
oxide with lowest proportion of oxygen: an oxide of an element that has the lowest proportion of oxygen of all the oxides of that element
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