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| a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells. |
| an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language. |
| altitude (ˈæltɪˌtjuːd) | |
| —n | |
| 1. | the vertical height of an object above some chosen level, esp above sea level; elevation |
| 2. | geometry the perpendicular distance from the vertex to the base of a geometrical figure or solid |
| 3. | astronomy, nautical Compare azimuth Also called: elevation the angular distance of a celestial body from the horizon measured along the vertical circle passing through the body |
| 4. | surveying the angle of elevation of a point above the horizontal plane of the observer |
| 5. | (often plural) a high place or region |
| [C14: from Latin altitūdō, from altus high, deep] | |
| alti'tudinal | |
| —adj | |