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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. |
extrasystole ex·tra·sys·to·le (ěk'strə-sĭs'tə-lē)
n.
An ectopic, usually premature contraction of the heart, resulting in momentary cardiac arrhythmia. Also called premature systole.