diachylon

1. (medicine) A plaster originally composed of the juices of several plants, later made of an oxide of lead and oil, and consisting essentially of glycerine mixed with lead salts of the fat acids.Examples: "Externally, I find the practitioners on whom I have chiefly relied used the plasters of Paracelsus, of melilot, diachylon, and probably diaphoenicon, all well known to the old pharmacopoeias, and some of them to the modern ones,—to say nothing of "my yellow salve," of Governor John, the second, for the composition of which we must apply to his respected descendant."countableuncountable