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Pronunciation: fos'jen

Definition: a colorless liquid below 8.2°C, but an extremely poisonous gas at ordinary temperatures; it is an insidious gas, given that it is not immediately irritating, even when fatal concentrations are inhaled; more than 80% of World War I's chemical agent fatalities were caused by phosgene.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.