Might mean (unverified): Early form of nitrous oxide.
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We found 2 dictionaries that define the word protoxyd:

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  1. protoxyd: Webster's 1828 Dictionary
  2. protoxyd: Wiktionary

Definitions from Wiktionary (Protoxyd)

noun:  Obsolete form of protoxide. [(inorganic chemistry) Any of a series of oxides of a particular metal that has the fewest atoms of oxygen per molecule]

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