The Collaborative International Dictionary
Protoxidize
Protoxidize \Pro*tox"i*dize\, v. t. (Chem.) To combine with oxygen, as any elementary substance, in such proportion as to form a protoxide.
Wiktionary
protoxidize
vb. (context chemistry transitive English) To combine (an elementary substance) with oxygen, in such proportion as to form a protoxide.