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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 stew of meat, vegetables, potatoes, etc. |
fuel (fy 'əl) Pronunciation Key
A substance that produces useful energy when it undergoes a chemical or nuclear reaction. Fuel such as coal, wood, oil, or gas provides energy when burned. Compounds in the body such as glucose are broken down into simpler compounds to provide energy for metabolic processes. Some radioactive substances, such as plutonium and tritium, provide energy by undergoing nuclear fission or fusion. |