An archaic or variant term for an enema or clyster; a medical instrument or treatment for internal washing.
From Greek klysis or klysma with variant Latin spelling. This appears to be an alternative form that circulated in medical texts, possibly a Latinized variant.
Clyssus is so archaic that it barely appears in modern medical dictionaries, but it survives in historical medical texts—a ghost word that shows how medical terminology evolved and consolidated over centuries.
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