Definition of protoxide Protoxide
pro•tox•ide
We found 3 definitions of protoxide from 3 different sources.
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What does protoxide mean?
Wiktionary 
Webster DictionaryWebster's Unabridged Dictionary 📘
- protoxide (n.)
That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b).
Chambers DictionaryChamber's 20th Century Dictionary 📕
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protoxide
prō-tok′sīd, n. the first oxide—that is, an oxide containing one equivalent of oxygen combined with one equivalent of a base
