A compound of oxygen with another element or a radical; e.g., mercuric o., HgO.
acid o. an acid anhydride; an o. of an electronegative element or radical; it can combine with water to form an acid.
basic o. a base anhydride; an o. of an electropositive element or radical; it can combine with water to form a base.
indifferent o. neutral o
neutral o. an o. that is neither an acid nor a base; e.g., water (hydrogen oxide, H2O).indifferent o;
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