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| 1. | a highly flammable composition, as Greek fire, difficult to extinguish when ignited, formerly used in warfare. |
| 2. | any large fire that spreads rapidly and is hard to extinguish. |
| 3. | sheet lightning, unaccompanied by thunder. |
| 4. | the ignis fatuus or a similar light. |
| 5. | Plant Pathology. a disease of tobacco and soybeans, characterized by brown, necrotic spots, each surrounded by a yellow band, on the leaves and caused by a bacterium, Pseudomonas tabaci. |
| 6. | Pathology Obsolete. erysipelas or some similar disease. |