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| a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells. |
| the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language). |
aortography a·or·tog·ra·phy (ā'ôr-tŏg'rə-fē)
n.
The radiographic visualization of the aorta and its branches by injection of a radiopaque substance.