| diesel engine or diesel motor | |
| —n | |
| a type of internal-combustion engine in which atomized fuel oil is sprayed into the cylinder and ignited by compression alone | |
| diesel motor or diesel motor | |
| —n | |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
diesel engine (dē'zəl) Pronunciation Key
(click for larger image in new window) An internal-combustion engine in which the fuel oil is ignited by the heat of air that has been highly compressed in the cylinder, rather than by a spark. Due to the need for the engine to withstand very high pressures, diesel engines are relatively heavy; however, they are relatively fuel-efficient, especially when running at low power. |