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| 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. |
| a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells. |
| paleontology (pā'lē-ŏn-tŏl'ə-jē) Pronunciation Key
The scientific study of life in the geologic past, especially through the study of animal and plant fossils. |
The study of ancient life forms, particularly as they are seen in fossils.