## What does it mean?
Carbon monoxide is a **colorless**, odorless gas that can be harmful to health. It is produced when fuels do not burn completely.
## Etymology (where it comes from)
The word "carbon" comes from Latin *carbo*, meaning "coal" or "charcoal." The word "monoxide" comes from Greek *mono-* meaning "one" and Latin *oxide* meaning "oxide" or "compound with oxygen."
## Historical origin
The term originated in the early 19th century. It was used in scientific discussions in Europe.
## Earliest records
The earliest mentions can be found in scientific journals and chemistry textbooks.
## Variants and usage by country
- **CO** (chemical symbol)
- **Carbon monoxide** (English)
- **Monóxido de carbono** (Spanish)
- **Monoxyde de carbone** (French)
## Related words
- **Carbon dioxide** (another gas)
- **Oxide** (a type of compound)
- **Combustion** (burning process)