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| a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells. |
| (used as a nonsense word by children to express approval or to represent the longest word in English.) |
| heliotropism (hē'lē-ŏt'rə-pĭz'əm) Pronunciation Key
The growth or movement of a fixed organism, especially a plant, toward or away from sunlight. Heliotropism can be easily seen in sunflowers, which slowly turn their large flowers so that they continually face the sun. heliotropic adjective (hēl'lē-ə-trō'pĭk, -trŏp'ĭk) |