- the one of a series of oxides having the smallest proportion of oxygen.
Also pro·tox·id [proh-tok-sid] /proʊˈtɒk sɪd/.
Origin of protoxide
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for protoxide
It consists of silica 25; protoxide of manganese 60; water 13.
Phosphate of protoxide of manganese; Manganesii phosphas, L. Prep.
Carbonate of protoxide of manganese; Manganesii carbonas, L. Prep.
Acetate of protoxide of manganese; Manganii acetas, L. Prep.
Sulphate of protoxide of manganese; Manganesii sulphas, L. Prep.
- the oxide of an element that contains the smallest amount of oxygen of any of its oxides