| reaction engine or reaction motor | |
| —n | |
| an engine, such as a jet or rocket engine, that ejects gas at high velocity and develops its thrust from the ensuing reaction | |
| reaction motor or reaction motor | |
| —n | |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a fool or simpleton; ninny. |
| reaction engine or reaction motor | |
| —n | |
| an engine, such as a jet or rocket engine, that ejects gas at high velocity and develops its thrust from the ensuing reaction | |
| reaction motor or reaction motor | |
| —n | |