| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| ramjet (rām'jět') Pronunciation Key
A cylindrical jet propulsion engine consisting of air intake and combustion chambers into which burning fuel is injected, forcing hot air out of the rear of the engine at high pressures to provide forward thrust. See Note at turbojet. |