The medical condition of spitting or expelling matter from the mouth, particularly blood or pus.
From Greek 'emptyo' meaning 'to spit out' combined with the suffix '-sis' indicating a condition or process. The term emerged in medical Latin during the medieval period to describe respiratory symptoms.
This is one of those archaic medical terms that shows how doctors used to describe symptoms we'd now call hemoptysis (coughing up blood) or expectoration, but emptysis specifically emphasized the spitting action itself—revealing how medicine was described through observable actions before modern imaging.
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