Diachylon

Diachylon (from Latin diachȳlōn, representing Greek διὰ χυλῶν, "[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. It is applied to sheets of linen, and works as an adhesive plaster when heated.