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

Gas seeps out of the magma and diffuses into the atmosphere, in theory enriching it in oxygen, silicon hydride and silicon monoxide, while going the other way the magma absorbs ammonia, methane and water vapor from the atmosphere. — Keith Cooper, Space.com, 13 July 2026

The red areas may indicate the presence of molecules such as silicon monoxide, which appear only when massive gas clouds collide. — Asuka Koda, CNN Money, 5 Mar. 2026

So far, the survey has identified more than 70 types of molecules in the galactic center, including both simple molecules, such as silicon monoxide, and more complex organic ones like ethanol and methanol. — Michele Laufik, Martha Stewart, 26 Feb. 2026

Carbon monoxide rebreathing falls into the category known as ‘grey areas’, something the MPCC is increasingly troubled by. — Chris Marshall-Bell, New York Times, 26 Feb. 2026

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