monoxide

noun

mon·​ox·​ide mə-ˈnäk-ˌsīd 

: an oxide containing one atom of oxygen in a molecule

Examples of monoxide in a Sentence

Recent Examples on the Web

Carbon monoxide is a quiet assassin. —Sara Novak, Scientific American, 11 Sep. 2025

The images and data captured the hot region around the protostar where Earth-like planets form, and show gaseous silicon monoxide condensing into solid silicate minerals—the same materials that make up the vast majority of Earth’s crust. —Rudy Molinek, Smithsonian Magazine, 18 July 2025

These old meteorites are full of crystalline minerals that contain silicon monoxide. —Laura Baisas, Popular Science, 16 July 2025

Within meteorites is a wealth of crystalline minerals that contain silicon monoxide, which condenses at high temperatures, such as those found in the protoplanetary disk around the sun during the formative period of the solar system. —Robert Lea, Space.com, 16 July 2025

Word History

Etymology

International Scientific Vocabulary

First Known Use

1868, in the meaning defined above

Phrases Containing monoxide

• carbon monoxide
• chlorine monoxide
• lead monoxide

Rhymes for monoxide

• hydroxide
• tetroxide

Kids Definition

monoxide

noun

mon·​ox·​ide mə-ˈnäk-ˌsīd 

: an oxide containing only one oxygen atom in the molecule

Medical Definition

monoxide

noun

mon·​ox·​ide mə-ˈnäk-ˌsīd 

: an oxide containing one atom of oxygen per molecule see carbon monoxide