Diachylon (from Latin diachȳlōn, representing Greek , "[a medicament] composed of juices"), also rendered diachylum or diaculum, was originally a kind of medicament made of the juices of several plants (thus its name), but now commonly the name for lead-plaster, emplastrum plumbi—a plaster made of lead oxide boiled together with olive oil and water.
Diachylon (derived from Latin diachȳlōn, signifying "a medicament composed of juices") originally denoted a plant-based remedy but is now generally synonymous with lead plaster, emplastrum plumbi—a paste created by combining lead oxide with olive oil and water.