carbon monoxide

noun

: a colorless odorless very toxic gas CO that is formed as a product of the incomplete combustion of carbon or a carbon compound

Examples of carbon monoxide in a Sentence

Recent Examples on the Web

Most of the fatalities were connected to the outages and included cases of hypothermia, carbon monoxide poisoning, and medical conditions exacerbated by freezing termperatures, according to FERC. —Spencer Kimball,gabriel Cortés, CNBC, 22 Nov. 2025

Employees reported feeling unwell after possible carbon monoxide exposure at the Savage Branch Library in Howard County, according to a post from the official Twitter page for the Executive Branch of Howard County Government. —Andrew Adeolu, CBS News, 21 Nov. 2025

Test smoke alarms, carbon monoxide detectors, and ensure your fire extinguisher is charged and accessible if needed. —Katie Rosenhouse, Southern Living, 17 Nov. 2025

After several days, carbon monoxide levels in your blood return to normal. —Md Published, Verywell Health, 17 Nov. 2025

Word History

First Known Use

1868, in the meaning defined above

Rhymes for carbon monoxide

• hydroxide
• tetroxide

Kids Definition

carbon monoxide

noun

: a colorless odorless very poisonous gas formed by the incomplete burning of carbon

Medical Definition

carbon monoxide

noun

: a colorless odorless very toxic gas CO that burns to carbon dioxide with a blue flame and is formed as a product of the incomplete combustion of carbon