The act or process of breathing out or expelling air from the lungs; exhalation.
From 'efflate' plus '-tion' suffix. Formed in the 16th-17th centuries as medical and philosophical texts needed precise vocabulary for describing respiratory processes.
Medieval doctors believed certain illnesses could be diagnosed by the quality of a patient's 'efflation'—the warmth, smell, and sound of their breath told stories about their internal humors.
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