cone maxrut (#) Fr.: cône A solid bounded by a plane and the surface generated by a straight line which always touches a simple closed curve on the plane and passes through a fixed point not on the plane. L. conus "a wedge, peak, cone," from Gk. konos "cone, spinning top, pine cone," from PIE base *ko(n)- "to sharpen." Maxrut from Ar. |
future light cone maxrut-e nuri-ye âyandé (#) Fr.: cône de lumière futur The set of all points in a → space-time diagram that are reached by signals travelling from a specified point at the speed of light. |
light cone maxrut-e nur (#) Fr.: cône de lumière The set of all directions in which a light signal can travel toward an event (past light cone) or from an event (future light cone). |
Mach cone maxrut-e Mach Fr.: cône de Mach The cone that confines the pressure disturbance created by a → supersonic object moving in a → compressible medium. → Mach number; → cone. |
shadow cone maxrut-e sâyé Fr.: cône d'ombre A cone-shaped shadow cast by Earth or the Moon pointing away from the Sun. The dark inner portion of the shadow cone is called the → umbra. The lighter outer portion of the shadow is called the → penumbra. Its extension is called the → antumbra. |