The formation or presence of pus; suppuration or the process of becoming infected with pus.
From Greek 'empyesis,' derived from 'en-' (in) and 'pyon' (pus), with the suffix '-sis' indicating a medical process or condition. Related to empyema but describing the general process rather than a specific location.
While empyema describes pus in a specific cavity, empyesis refers to the broader process of pus formation itself—this distinction was crucial for pre-modern physicians who had to understand infection progression before they understood germ theory.
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