carbon monoxide 
noun [mass noun]
A colourless, odourless toxic flammable gas formed by incomplete combustion of carbon.
- Chemical formula: CO.
- Obvious examples are water, methane, carbon dioxide, carbon monoxide, and sulphur dioxide.
- It's only trees that sequester carbon dioxide and carbon monoxide from the polluted air.
- Manola
- manoletina
- Manolo Blahnik
- manometer
- manometric
- manometric capsule
- ma non troppo
- manool
- manor
- man orchid
- man orchis
- manor court
- man (or go to) the barricades
- manor house
- manorial
- manorialisation
- manorialise
- manorialism
- manorialization
- manorialize
- manorial system
- manor plantation
- manor-seat
- man (or woman) of the people
- man (or woman) of the world