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| ratio of longitudinal strain to longitudinal stress |
| force per unit area |
| artificial horizon | |
| —n | |
| 1. | Also called: gyro horizon an aircraft instrument, using a gyroscope, that indicates the aircraft's attitude in relation to the horizontal |
| 2. | astronomy a level reflecting surface, such as one of mercury, that measures the altitude of a celestial body as half the angle between the body and its reflection |