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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. |
| aerobiology (âr'ō-bī-ŏl'ə-jē) Pronunciation Key
The scientific study of the sources, dispersion, and effects of airborne biological materials, such as pollen, spores, and microorganisms. |