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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a chattering or flighty, light-headed person. |
| carbon monoxide | |
| —n | |
| a colourless odourless poisonous flammable gas formed when carbon compounds burn in insufficient air and produced by the action of steam on hot carbon: used as a reducing agent in metallurgy and as a fuel. Formula: CO | |
carbon monoxide n.
A colorless, odorless, highly poisonous gas that is formed by the incomplete combustion of carbon or of a carbonaceous material, such as gasoline.
| carbon monoxide
A colorless, odorless gas formed when a compound containing carbon burns incompletely because there is not enough oxygen. It is present in the exhaust gases of automobile engines and is very poisonous. Chemical formula: CO. |
A compound made up of molecules containing one carbon atom and one oxygen atom.
Note: Carbon monoxide is usually formed when materials burn; it is found, for example, in automobile exhaust.
Note: Carbon monoxide is a colorless, odorless gas that can be fatal to human beings if inhaled.